Guide to the Allegheny Observatory Records, 1850-1977 UA.5.1

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ULS Archives & Special Collections

Table of Contents

Summary Information
History
Scope and Content Notes
Arrangement
Administrative Information
Controlled Access Headings
Previous Citation
Collection Inventory
Series I. Correspondence of Directors/Acting Directors,1850-1977
1. Samuel Pierpoint Langley,1850-1896, 1899
2. Frank Washington Very,1864-1895
3. James Edward Keeler,1887-1898
4. John Alfred Brashear,1866-1903
5. F.L.O. Wadsworth,1894-1905, 1907
6. Frank Schlesinger,1899-1920, 1907
7. Heber D. Curtis,1916-1930
8. Frank C. Jordan,1908-1941
9. Nicholas E. Wagman,1930-1970
10. Joost H. Kiewiet de Jonge,1953-1977
Series II. Letterpress Books of Directors/Acting Directors,1862-1910
1. Samuel Pierpont Langley,1884-1889
Series III. Directors/Acting Directors Miscellany,1863-1978
1. Samuel Langley
2. Frank Very
3. James Keeler
6. Frank Schlesinger
7. Heber Curtis
8. Frank Jordan
9. Nicholas Wagman
Series IV. Correspondence of Affiliated Astronomers,1886-1972
1. Frank Bartko,1960-1971
2. Wallace Beardsley,1958-1970
3. Kievin Burns,1920-1958
4. Zaccheus Daniel
Series V. Affiliated Astronomers Miscellany,no date
1. Kievin Burns
2. Zaccheus Daniel
3. J.H. Kiewiet de Jonge
4 Wallace Beardsley
5. Robert Kemper
Series VI. Administrative Files,1858-1977
1. University of Pittsburgh (Western University of Pennsylvania prior to 1909)
2. Reports and Minutes
3. Building Specifications
4. Library
5. Allegheny Observatory Committee
6. General Office Files
7. William Thaw File
Series VII. Observation,1869-1930
1. Notebooks
2. Drawings
Series VIII. Graphic Materials,1878-1910
1. Mechanical Drawings
2. Notes and Research (New Material Added, 2013)
Series IX. Publicity,1893-1902
Series X. News Clippings (Miscellaneous),1907-1947
Series XI. Scrapbooks,1873-1917
Series XII. Organizations and Societies,1899-1960
1. Astronomical Society of Pittsburgh
2. American Astronomical Society
3. National Science Foundation2013
4. Extrasolar Planetary Foundation
5. Other Organizations
Series XIII. Publications,1870-1975
1. Monographs
2. Pamphlets
3. Reprints and Scholarly Papers
Series XIV. Correspondence (Miscellaneous),1881-1900
Series XV. History,1912-1987
Series XVI. Photographs,1886-1922
1. Photographic Negatives
2. Photographic Prints
Series XVII. Student Records,1960-1977

Summary Information

Repository
ULS Archives & Special Collections
Title
Allegheny Observatory Records
Creator
Allegheny Observatory.
Collection Number
UA.5.1
Date
1850-1977
Extent
43.5 linear feet (98 boxes)
Abstract
The Astronomical Observatory was founded in 1858 by the Allegheny Telescope Association in Allegheny, PA (now the North Side of Pittsburgh) and deeded to the Western University of Pennsylvania (now the University of Pittsburgh) in 1867. The records contain directors files, administrative files, notebooks, drawings, mechanical drawings, photographic prints and negatives, news releases, newsclippings, historical documents, and articles written about the Observatory. Digital reproductions of selected photographs are available online.

Preferred Citation

Allegheny Observatory Records, 1850-1967, UA.5.1, University Archives, Archives & Special Collections, University of Pittsburgh Library System

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History

The appearance of the comet known as "Donati's Comet", discovered in Florence by Giovanni Donati on June 2, 1858, gave the initial stimulus to the founding of the observatory. Interest in the comets appearance caused a group of men (professional and business) to form the Allegheny Telescope Association. This group, among whom the most prominent were Professor Louis Bradley, Josiah King and Harvey Childs, met in Bradley's home on February 15, 1858, and resolved not only to found the A.T.A. but also to purchase a telescope.

On January 31, 1860, the A.T.A. ordered a 13-inch telescope from Henry Fitz of New York, and it was installed in 1861. On May 15, 1860, the A.T.A. officially adopted a constitution and by-laws, elected a board of directors, and appointed an Observatory Committee. This committee raised funds by subscription for the telescope and housed it in a new building which they called the "Allegheny Observatory" as it was centered on a hill on Perrysville Avenue in the old city of Allegheny.

Professor Bradley was custodian of the new telescope from 1861-1863. In 1865, Professor Philotus Dean, principal of Central High School in Pittsburgh, became first custodian of the Observatory. Both men served without pay, accepting the responsibility of the Observatory to promote the advance of science. Later in 1865, the A.T.A. deeded the telescope, the building and the land to the Western University of Pennsylvania (now University of Pittsburgh). In 1867, the official transfer was completed and Samuel Langley was appointed Director. Among many other accomplishments, Langley invented a device to measure the temperatures on the Sun's surface, known as a bolometer; "Standardized" time for railroad companies; and coined the terms "astrophysics" and "aerodynamics"

When Langley left to become Secretary of the Smithsonian in 1887, James Keeler became the acting director and used the 13" Fitz-Clark telescope to discover Saturn's rings were made of small particles instead of being one large disk. In the early 1890s, because of the increasing air pollution in Pittsburgh and the need for larger research facilities, a new building at a new site was designed. The new Allegheny observatory was built between 1900 and 1914 in Riverview Park. The old observatory was sold and at one point a hospital for an orphanage. The building was torn down in 1955.

The Fitz-Clark 13" is still used today. In 1974 a bequest in the memory of George Theiss was made to the Observatory allowing for renovations on the Thaw and Keeler Telescopes. The George W. Theiss Astronomical Laboratory was also established and houses machines used to measure stellar images obtained from telescopes. The Thaw lens was replaced in 1985.

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Scope and Content Notes

The records contain correspondence and letterpress books belonging to ten of the observatory's directors, directors' miscellany, notes, articles, and correspondence. Records also include administrative files, notebooks, drawings, mechanical drawings, photographic prints and negatives, news releases, news clippings, a scrapbook, and historical documents and articles written about the Observatory.

Note: Series I (Correspondence of Directors and Acting Directors); Series II (Letterpress books of Directors and Acting Directors); and Series IV (Correspondence of affiliated astronomers) have been microfilmed. A detailed unpublished index to items in those series appear in Indexes to the Microfilmed Correspondence of Directors, Acting Directors and Selected Astronomers Among the Records of the Allegheny Observatory held by the Archives. In addition a large portion of the correspondence and letterpress books of Director Frank Schlesinger were microfilmed by the Center of History of Physics of the American Institute of Physics and the Archives of Industrial Society. The Schlesinger correspondence, ranging from 1905 through 1941, which was held by both the Archives of Industrial Society and the Center of History of Physics, Yale University Library was microfilmed as part of the project, "Sources for History of Modern Astrophysics."

Note: Additional notes and information are located at the series level including brief biographies of Directors.

A new series was added with the 2009 deposit to include some files on students affiliated with the Observatory.

New Material Added: Additional material was added in 2013 and includes additions to Series I (Correspondence of Directors and Acting Directors), Series IV (Correspondence of affiliated astronomers); Series VI (Administrative Files); Series VIII (Graphic Materials), Series XII (Organizations and Societies), Series XIII (Publications) and Series XVII (Photographs). An additional series, Series XVII (Student Records) was also created.

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Arrangement

The collection is arranged into the following 16 series:

Series I. Correspondence of Directors / Acting Directors, 1850-1977

Series II. Letterpress Books of Directors / Acting Directors, 1862-1910

Series III. Directors / Acting Directors Miscellany, 1863-1978

Series IV. Correspondence of Affiliated Astronomers, 1886-1972

Series V. Affiliated Astronomers Miscellany

Series VI. Administrative Files, 1858-1977

Series VII. Observation, 1869-1930

Series VIII. Graphic Materials, 1878-1910

Series IX. Publicity, 1893-1902

Series X. Newsclippings (Miscellaneous), 1907-1947

Series XI. Scrapbooks, 1873-1917

Series XII. Organizations and Societies, 1899-1960

Series XIII. Publications, 1870-1939

Series XIV. Correspondence (Miscellaneous), 1881-1900

Series XV. History, 1912-1987

Series XVI. Photographs, 1886-1922

Series XVII. Student Records, 1960-1977

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Administrative Information

Publication Information

ULS Archives & Special Collections, February 1968

University of Pittsburgh Library System
Archives & Special Collections
Website: library.pitt.edu/archives-special-collections
412-648-3232 (ASC) | 412-648-8190 (Hillman)
Contact Us: www.library.pitt.edu/ask-archivist

Revision Description

 New materials added to finding aid by Ian McGlory in 2012-2013.  February 2013

Access Restrictions

Series XVII. Student Records are restricted. Some papers in Series XII, Publications, have restrictions on the student records in the section called Reprints and Scholarly Papers. Access to this material is based on researcher signing a memo of confidentiality.

Copyright

Permission for publication is given on behalf of the University of Pittsburgh as the owner of the physical items and is not intended to include or imply permission of the copyright holder, which must also be obtained.

Acquisition Information

Original deposit by Nicholas Wagman, Director, Allegheny Observatory, on February 28, 1964. Second deposit of 9 boxes by Louis Coban on November 2, 2009.

Processing Information

This collection was processed by Frank Nederhoff in 1968. The second deposit was processed by Ian McGlory from September 2012 through February 2013.

Existence and Location of Copies

Series I, II, and IV have been microfilmed. A detailed inventory of those items microfilmed can be found in the unpublished "Indexes to the Microfilmed Correspondence of Directors, Acting Directors and Selected Astronomers Among the Records of the Allegheny Observatory" located at the Archives Service Center. In addition, a large portion of the correspondence of Director Frank Schlesinger and his letterpress books were microfilmed by the Curator in History of Physics of the American Institute of Physics. The correspondence, ranging from 1905 through 1941, held by both the Archives Service Center and the Yale University Library, was microfilmed as part of the project, "Sources for History of Modern Astrophysics" and is available in AIS.1981.06 microfilm (Microfilm-cabinet 2, Drawer 9 and Microfilm-cabinet 3, Drawer 1).

Digital reproductions of selected photographs can be found at http://historicpittsburgh.org/collection/allegheny-observatory-records.

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Controlled Access Headings

Corporate Name(s)

  • Allegheny Observatory.
  • American Astronomical Society.
  • Astronomical Society of Pittsburgh.
  • University of Pittsburgh.
  • Western University of Pennsylvania.

Genre(s)

  • Clippings (Information artifacts)
  • Correspondence
  • Notebooks
  • Photographs
  • Records (Documents)

Personal Name(s)

  • Brashear, John A. (John Alfred), 1840-1920
  • Jordan, Frank Craig, 1865-1941 -- Correspondence
  • Keeler, James Edward, 1857-1900 -- Correspondence
  • Langley, S. P. (Samuel Pierpont), 1834-1906 -- Correspondence
  • Schlesinger, Frank, 1871-1943 -- Correspondence

Subject(s)

  • Astronomers -- Pennsylvania -- Pittsburgh -- Biography
  • University of Pittsburgh

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Previous Citation

Allegheny Observatory Records, 1850-1967, UA.5.1, University Archives, Archives Service Center, University of Pittsburgh

Records of Allegheny Observatory, 1850-1967, ais 64.22, Archives of Industrial Society, Hillman Library, University of Pittsburgh.

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Collection Inventory

Series  I. Correspondence of Directors/Acting Directors, 1850-1977 

Subseries  1. Samuel Pierpoint Langley, 1850-1896, 1899 

Scope and Content Notes

Samuel Pierpoint Langley was born in Roxbury, MA, on August 22, 1834 and was Director of the observatory from 1867-1887. After graduating from the Boston Latin School, he studied civil engineering and architecture. His first employment was as an assistant in the Observatory at Harvard University; soon afterwards he became an instructor at the United States Naval Academy at Annapolis. In 1867 Langley became the Director of the Allegheny Observatory which had been transferred from private hands to the Western University of Pennsylvania; at the same time he was elected to the chair of Astronomy and Physics at the University.

Langley's main field of interest was the sun. He made detailed drawings of sunspots, invented the bolometer (an instrument to measure the amount of heat in different parts of the sun's spectrum), and obtained accurate time by using the telescope and positions of the stars. He also made accurate time available to Pittsburgh, City Hall, and to local railroads--even the U.S. Naval Observatory used his system (Allegheny System) to supply the correct time to the nation. During his term Mr. William Thaw contributed much money to the Observatory as did Andrew Carnegie who stated: "This was my first considerable gift to an institution of learning." Langley left to become first assistant secretary and then secretary to the Smithsonian Institute. He remained in that position until his death in 1906. Samuel Pierpont Langley died in Aiken, South Carolina, on February 26, 1906.

  BoxFolder
11
  Folder
Ba-Be 2
  Folder
Bi-Bu 3
  Folder
Ca-Coo 4
  Folder
Cop-De 5
  Folder
Du-El 6
  Folder
Er-Gilb 7
  Folder
Gill-Gr 8
  Folder
Ha-Hilga 9
  Folder
Hilge-Ho 10
  Folder
Hu-Ki 11
  Folder
Ki-Lel 12
  Folder
Les-Lone 13
  Folder
Longitude 14-18
  Folder
Lou-McG 19

Includes McConnel letter.

  Folder
McI-Mai 20
  Folder
Mal-May 21
  Folder
Maz-Mid 22
  Folder
Mil-Mt 23
  Folder
Mu-Na 24
  Folder
Ne-Ob 25
  BoxFolder
Oi-Pee 226
  Folder
Pem-Pen 27
  Folder
Ph-Pi 28
  Folder
Po-Rei 29
  Folder
Rep-Roq 30
  Folder
Roo-Sal 31
  Folder
San-Sl 32
  Folder
Smil-Smit 33
  Folder
Sny-Stev 34
  Folder
Stew-Te 35
  Folder
Thaw 36-42
  Folder
Th-Ts 43
  Folder
U.S. Signal 44-45
  Folder
U.S. Government Printing - U.S. Navy 46
  Folder
Up-Was 47
  Folder
Wat-We 48
  Folder
Wht 49
  Folder
Why-Y 50
  Folder
Addendum, 1871-1899 50A
To: Barns, Carl B. (U.S. Geological Survey, Washington, D.C.), March 31, 1886-November 14, 1887 
To: Pennsylvania Company (O.H. Booth, Superintendent, Mansfield, Ohio), March 18, 1873 
From: Goff, M.B. (Chancellor, Western University of Pennsylvania), November 30, 1899 
From: Meysan, Charles, esq. (Pittsburgh), December 2, 1871 

Subseries  2. Frank Washington Very, 1864-1895 

Scope and Content Notes

Frank Washington Very was Langley's assistant and was placed in charge of the observatory when Langley was appointed the Assistant Secretary of the Smithsonian Institution in 1887.

  BoxFolder
A-B 351
  Folder
52
  Folder
D-G 53
  Folder
H-J 54
  Folder
K-L 55
  Folder
M-P 56
  Folder
Q-S 57
  Folder
T-U 58
  Folder
V-Z 59

Subseries  3. James Edward Keeler, 1887-1898 

Scope and Content Notes

James Edward Keeler was Director from 1891-1898. Keeler used the 13-inch telescope to make spectroscopic studies and discovered that the rings of Saturn are not solid but composed of a multitude of small particles. In 1898, he left to become director of Lick Observatory.

  Folder
Ac-Al 60
  Folder
Am 61
  Folder
An-Astronomi 62
  Folder
Astronomy-At 63
  Folder
Au-Bar 64
  Folder
Bau-Bi 65
  Folder
Bl-Bos 66
  Folder
Bot-Bri 67
  Folder
Bro-Burc 68
  Folder
Brue-Cal 69
  Folder
Cam 70-73
  Folder
Car-Chic 74
  Folder
Chid-Clap 75
  BoxFolder
Clar-Cod 476
  Folder
Col-Cot 77
  Folder
Cre 78
  Folder
Cro-Da 79
  Folder
De-Do 80
  Folder
Dr-Dz 81
  Folder
82
  Folder
Fa-Fe 83
  Folder
Fi-Fr 84
  Folder
Gi-Gr 85
  Folder
Hale 86-100
  BoxFolder
Hale 5101-102
  Folder
Hall-Hapr 103
  Folder
Har-Hau 104
  Folder
Hay-Hof 105
  Folder
Hol 106-108
  Folder
Hou-Hu 109
  Folder
Hy-Je 110
  Folder
Ji-Jo 111
  Folder
Ju 112
  Folder
Ka-Ki 113
  Folder
Ki-Led 114
  Folder
Lem-Li 115
  Folder
Lo 116
  Folder
Lu-Mat 117
  Folder
Man-Mil 118
  Folder
Min-Nel 119
  Folder
New-No 120
  Folder
O-Pat 121
  Folder
Pay 122-124
  BoxFolder
Pay 6125-127
  Folder
Pe 128
  Folder
Ph-Pie 129
  Folder
Pih-Pot 130
  Folder
Pr-Ramb 131
  Folder
Rams-Reed 132
  Folder
Rees-Roc 133
  Folder
Rum-San 134
  Folder
Sar-Scha 135
  Folder
Schu-Si 136
  Folder
Sh-So 137
  Folder
Sp 138
  Folder
Sta-Step 139
  Folder
Steu-Sto 140
  Folder
Str-Th 141
  Folder
To-Ts 142
  Folder
US 143
  Folder
Un-Va 144
  Folder
Vee 145-147
  Folder
Vo-Wan 148
  Folder
Wain 149-150
  BoxFolder
Warr-Way 7151
  Folder
Way, M. 152
  Folder
We-Will 153
  Folder
Wil-Wol 154
  Folder
Woo-Ye 155
  Folder
Yo-Z 156
  Folder
University of Pittsburgh (Western University of Pennsylvania) 157

Subseries  4. John Alfred Brashear, 1866-1903 

Scope and Content Notes

John Alfred Brashear was Director Pro Tem from 1898-1900. Brashear was originally a mill worker, but, encouraged by his friend S.P. Langley and financially supported by William Thaw, he became a renowned lens-maker, setting up the Brashear Company which constructed both the 30-inch Thaw Memorial Telescope and the James E. Keeler Memorial Telescope. In 1867 Brashear raised matching funds from Thaw and Carnegie and he and Keeler drew up plans for a new observatory and equipment. In 1898, Keeler declared "The Observatory's usefulness is at an end" due to antiquated equipment, the encroachment of homes, factories, and the smoky, hazy atmosphere which obscured vision. Brashear spoke eloquently for aid in constructing a new "Temple of the Skies," but both the Panic of 1893 and the War of 1898 hampered the raising of funds. Discouraged, Keeler left for Lick Observatory at the University of California.

When Keeler died in 1906, his ashes were placed in the crypt of the memorial telescope built for him. Brashear persevered in his efforts to build a new observatory, eventually raising the $300,000 needed and securing a plot of land in Riverview Park. Appropriately, when the new observatory was dedicated in 1912, he was master of ceremonies (as he had been at the laying of the cornerstone in 1900). Upon their deaths, the ashes of both Brashear and his wife were also enclosed in the crypt (with Keeler's ashes) of the Keeler Memorial Telescope--the tablet bears the inscription "We have loved stars too fondly to be fearful of the night," words chosen by Brashear from "The Old Astronomer to His Pupil," a poem by Sarah William.

  Folder
B-Ca 158
  Folder
Co-Hal 159
  Folder
Har 160-166
  Folder
Has-Hu 167
  Folder
168
  Folder
Ma 169
  Folder
Mc-Pg 170
  Folder
Ph-S 171
  Folder
172-173
  Folder
U-V 174
  Folder
175
  Folder
Addendum - Unsigned Letter, Pittsburgh, August 27, 1887 175A

Subseries  5. F.L.O. Wadsworth, 1894-1905, 1907 

Scope and Content Notes

F.L.O. Wadsworth was Director from 1900-1905. It was during Wadsworth's directorship on October 20, 1900 that the cornerstone of the new building was laid. Modifying and adding to the plans he was mostly concerned with the supervision of the construction of the new buildings and instruments. He also exerted his influence, along with Brashear and the Observatory Committee, in raising the needed funds. The Observatory was completed in 1905, but the work of equipping it delayed dedication until 1912.

  BoxFolder
Ab-Ae 8176
  Folder
Ab-Alb 177
  Folder
Ale-Alle 178
  Folder
Alli-American 179
  Folder
American B-American J 180
  Folder
American L-American W 181
  Folder
Ames 182
  Folder
Amh-Ar 183
  Folder
Astronomic 184
  Folder
Astronomics-Ay 185
  Folder
Bac-Baker 186
  Folder
Baker 187-189
  Folder
Bakh 190
  Folder
Bal-Barr 191
  Folder
Barr-Bec 192
  Folder
Bed-Ber 193
  Folder
Bi 194
  Folder
Bl-Bol 195
  Folder
Bon 196
  Folder
Bor-Bow 197
  Folder
Bra 198-199
  Folder
Bre-Brown 200
  BoxFolder
Bou-Bur 9201
  Folder
Burn-By 202
  Folder
Cad-Came 203
  Folder
Camph 204
  Folder
Can-Carnegie 205
  Folder
Caregies 206
  Folder
Cas-Cau 207
  Folder
Cent 208
  Folder
Chab-Chan 209
  Folder
Chan-Chic 210
  Folder
Chil 211
  Folder
Chr-Clark, G. 212
  Folder
Clark, U. 213
  Folder
Cle 214
  Folder
Cob-Col 215
  Folder
Com-Cop 216
  Folder
Cn-Cow 217
  Folder
Cr 218
  Folder
Cr-Dam 219
  Folder
Dave-Davi, L.C. 220
  Folder
Davi, H. 221
  Folder
Davi W.-Der 222
  Folder
Det-Di 223
  Folder
Do 224
  Folder
Dr 225
  BoxFolder
Eb-Ec 10226
  Folder
Ed-Elk 227
  Folder
Ell-En 228
  Folder
Eq-Ev 229
  Folder
Fa 230
  Folder
Fe-For 231
  Folder
Fos-Fow 232
  Folder
Fra-Fri 233
  Folder
Fro-fu 234
  Folder
Ga-Gi 235
  Folder
Gi-Go 236
  Folder
Gr-Hag 237
  Folder
Hale 238-244
  Folder
Hall-Ham 245
  Folder
Har 246
  Folder
Has 247
  Folder
Harv 248-249
  Folder
Haw-Hen 250
  BoxFolder
Her 11251
  Folder
Hev-Hoo 252
  Folder
Hos-Howa 253
  Folder
Howe-Hul 254
  Folder
Hum-Hut 255
  Folder
Hus-Ins 256
  Folder
Int-Ir 257
  Folder
Ja-Joh 258
  Folder
Jon 259
  Folder
Ju-Kat 260
  Folder
Kay-Ke 261
  Folder
Kev-Ki 262
  Folder
Kin 263
  Folder
Kk-Ko 264
  Folder
Kra 265
  Folder
Kre-Lawa 266
  Folder
Lea-Leo 267
  Folder
Les-Li 268
  Folder
Loc-Loo 269
  Folder
Lord 270-272
  Folder
Lore-McA 273
  Folder
MacB-McP 274
  Folder
Mag-Marq 275
  BoxFolder
Mari-Mel 12276
  Folder
Men-Merria 277
  Folder
Merril 278
  Folder
Merrit-Met 279
  Folder
Mic-Mil 280
  Folder
Min-Mou 281
  Folder
Mur-Mut 282
  Folder
My-Nam 283
  Folder
Nat-Nau 284
  Folder
New 285
  Folder
Nich-Nis 286
  Folder
Nors-North 287
  Folder
North W-Observatoire C 288
  Folder
Observatoire DeB-Observatoire Der 289
  Folder
Observatoire DeZ-Observatoire M 290
  Folder
Observatoire M-Observatoire N 291
  Folder
Observatoire N-Observatoy C 292
  Folder
Observatory G-Observatory T 293
  Folder
Oe-Ol 294
  Folder
On-Os 295
  Folder
Pag-Pat 296
  Folder
Pau-Pen 297
  Folder
Per-Pet 298
  Folder
Ph-Pic 299
  Folder
Pie-Pit 300
  BoxFolder
Pl-Pop 13301
  Folder
Por-Poy 302
  Folder
Pra 303
  Folder
Pre-Ram 304
  Folder
Ras-Rat 305
  Folder
Ray-Roose, A. 306
  Folder
Reese, H.-Reg 307
  Folder
Rep-Rie 308
  Folder
Rob-Roo 309
  Folder
R.T.-R.O. 310
  Folder
Roy 311
  Folder
Ru-Sca 312
  Folder
Sch-Scho 313
  Folder
Schu-Se 314
  Folder
Sec-See 315
  Folder
Sh-Smith 316
  Folder
Smiths 317
  Folder
Sn 318-321
  Folder
Soc-Sol 322
  Folder
Som-Stah 323
  Folder
Standard R. 324
  Folder
Standard U-Steb 325
  BoxFolder
Stec 14326-328
  Folder
Ster-Sterr 329
  Folder
Sted-Skw 330
  Folder
Sti-Strab 331
  Folder
Strat 332-333
  Folder
Straw-Sy 334
  Folder
Ta-Th 335
  Folder
Ti-Tu 336
  Folder
Uf-U.S.B. 337
  Folder
U.S. C-U.S. Coa 338
  Folder
U.S. Col-U.S. Ge 339
  Folder
U.S. Gl-U.S.N. 340
  Folder
U.S.O.-Univ 341
  Folder
Up-Va 342
  Folder
Ve-Wal 343
  Folder
War-Wat 344
  Folder
Web-Wesh 345
  Folder
Westi-Whifn 346
  Folder
Whill-Wilson L. 347
  Folder
Wilson M.-Wood, E.M. 348
  Folder
Wood, R.W.-Wu 349
  Folder
Ya-Z (misc.) 350

Addendum, 1894-1904 

  Folder
A-D 350A
  Folder
E-K 350B
  Folder
L-W 350C

Subseries  6. Frank Schlesinger, 1899-1920, 1907 

Scope and Content Notes

Frank Schlesinger was Director from 1905-1920. Originally from Yerkes Observatory in Williams Bay, Wisconsin, Schlesinger was also president of the American Astronomical Society. His main research interest was the improvement of parallax measurements, a method of determining the distances to stars. The results of his investigations are world-renowned and he was considered an authority in that area of research. On the afternoon of Wednesday, August 28, 1912, the new observatory (Mr. Billquist was the chief architect) was dedicated and presented to the University of Pittsburgh. In the fall of 1907 Mrs. Christopher Lyman Magee donated funds to the Observatory for the purpose of establishing a publication for the research conducted by the Observatory which had been scattered throughout a variety of scientific periodicals. The first volume of the Allegheny Observatory came out in 1912 under the editorship of Frank Schlesinger. In 1920 Schlesinger left to assume the directorship of Yale Observatory.

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Ad 15351
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Ai-Al 352
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American A 353-355
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American I-Bak 356
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Barn 357-358
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Barn-Bon 359
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Bos 360-365
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Boy-Bra 366
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Bre-By 367
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Cam 368
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Can-Cu 369
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Da-Di 370
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Do-Ed 371
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Ei-Fow 372
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Fox 373-375
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Fra-Fro 16376
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Fro 377-378
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Fro-G 379
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Hal 380-383
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Har-Hy 384
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In-Kaj 385
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Kap 386-387
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Kay-Le 388
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Li-McD 389
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McK-Ma 390
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Mea 391
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Mec-Mi 392
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Na 393
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Ne 394
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Ni-Ph 395
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Pic 396-400
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Pic 17401-403
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Pic-Roy 404
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Ru 405-406
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St. F-Sta 407
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Ste-Tay 408
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Th 409
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Ti-Tr 410
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Tu 411
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U.S. 412
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Va-Wan 413
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War 414
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We-Wo 415
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Y-Z (and University Correspondence) 416

Correspondence from AIS/Yale University Project 

General note

This portion of the collection was microfilmed by the Curator in History of Physics of the American Institute of Physics. The correspondence, ranging from 1905 through 1941, held by both the Archives Service Center and the Yale University Library, was microfilmed as part of the project, Sources for History of Modern Astrophysics and is available as ais 81:6 microfilm.

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Abbot (Smithsonian) 17a1
Acker, Louis (Western University) 
Adams, C.E. (Lick Observatory) 
Adams, E. 
Adams Express 
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Adams, Walter (Mt. Wilson Solar Observatory) 2
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Adlers, Cyrius (Smithsonian) 3
Aiken Co. 
Air Service War Dept. 
Aitken, R.G. (Lick Observatory), 1905-1911 
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Aitken, R.G. (Lick Observatory), 1912-1915 4
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Aitken, R.G. (Lick Observatory), 1916-1918 5
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Albrecht, S. (Astronomical Observatory - Argentina) 6
Alexander Bros. 
Observatoire di Alger. 
Allegheny Co. Light Co. 
Allegheny Heating Co. 
Allegheny Observatory 
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Allen, Frances 7
Allen, Leah (Wellesley College) 
Allritson, Alice (Nantucket Maria Mitchell Assoc.) 
Alter, Dinsmore (Allegheny Observatory), 1909-1910 
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Alter, Dinsmore (Allegheny Observatory), 1911-1912 8
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Alter, Dinsmore (Allegheny Observatory), 1913 9
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Alter, Dinsmore (Allegheny Observatory), 1914-1919 10
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Aluminum Rectifiers Co. 11
Ambrose, Fred 
American Astronomical Society 
  Folder
American Electrical Heater Co. 12
American Express Co. 
American Shipping Co. 
American Warming and Ventilating 
Ames, J. S. (Johns Hopkins University) 
Ames, M. (Chemical Works) 
Ankrom, Anna 
Anderson, A.H. 
Anderson, J. A. (Johns Hopkins University) 
Apparatus on Loan 
Appleton (D.) and Co. 
Arbuthnot, Th. (University of Pittsburgh) 
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Archenold, F.S. (Treptow - Sternwarte) 13
Archiv. 
Aretin 
Armstrong. (Treasury Dept.) 
Arnaud, J.J. 
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Asthus 14
Astronomical and Astrophysical Society of America 
Astronomical Journal 
Astronomical Society of Wales 
Atlantic Refining Co. 
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Azearate, T. (de Institute and Observatory of Marina of San Fernando) 15
Backlund, O. (Observatory Fulkowa, Russia) 
Bacon, Robert 
Bailey, Frank K. 
Bailey, Solon S. (Harvard) 
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Baillaud, B. (Paris Observatory) 16
Baird Machinery Co. 
Baker Office Furniture 
Baker, Robert H. Amherst Observatory, 1906-1910 
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Baker, Robert H. Amherst Observatory, 1911 17
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Baker, Robert H. Amherst Observatory, 1912-1919 18
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Baker and Taylor Co. 19
Baldwin, H. A. (YMCA) 
Bane, Herman H. (War Dept.) 
Barber, Ethel F. (University of Pittsburgh) 
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Barnard, E.E. (Yerkes), 1904-1910 20
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Barnard, E.E. (Yerkes), 1911-1913 21
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Barnard, E.E. (Yerkes), 1914 22
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Barnard, E.E. (Yerkes), 1915-1919 23
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Barr, G.M. (British Astronomical Assoc.) 24
Barrett, Storrs B. (Yerkes) 
Barritt, Leon (Monthly Evening Sky Map) 
Barrows, Albert (American Assoc. for Advancement of Sciences) 
Bartberger, C.M. 
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Barth, Johanna 25
Bartlett, H.N. (Westinghouse) 
Bauer, L.A. (Carnegie Institute of Washington) 
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Beal, A.F. (U.S. Coast and Geodetic Survey) 17b1
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Bealor, John T. 2
Bucher, Jacob, F. (Waynesburg College) 
Bellows, John 
Belopolsky, A. (Sternwarte) 
Benjamin, Marcus (U.S. National Museum) 
Bentabal, Horacio (Engineer of Mines and Law, Madrid) 
Bentley, E.A. (Pittsburgh Fire Extinguisher Co.) 
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Biddle, James G. 3
Biesbroeck, G. 
Bigalow, Ralph K. 
Bigelow, Edward F. 
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Bigelow, Harriet W. (Smith College Observatory) 4
Billings (New York Public Library) 
Billquist, T. E. 
Birbirish, A. 
Black, A. and C. 
Blair, G.B. (Washburn College, Morningside College) 
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Blarcom 5
Block, Dorothy 
Blum, Louis P. (W.G. Wilkins co.) 
Boggs and Buhl 
Bohlin, K. 
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Bond, J. L. 6
Bower, Ernest Clare (U.S. Naval Observatory) 
Borgmann, Emil 
Borst, G. W. (The Electric Club) 
Boss, Benjamin (Dudley Observatory), 1908-1913 
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Boss, Benjamin (Dudley Observatory), 1914-1920 7
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Boss, Lewis (Carnegie Institution) 8
Bouardi, J. 
Boudin, Samuel 
Bouesley, George T. (Engineer's Society) 
Bowes, Homer 
Bowie, William (Dept. of Labor and Commerce) 
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Brand, A. 9
Brasch, F. E. 
Brashear, John A. 
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Brashear, John A. Co., Ltd., 1906-1908 10
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Brashear, John A. Co., Ltd., 1909-1910 11
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Brown, Charles O. (Mellon Institute) 12
Brown, G.W. (Yale University) 
Brown, (Morris and Co.) 
Bruns 
Buchanan, J.S. 
Burger, William J. 
Burke, George (Dept. of Public Works) 
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Burns, Kievin (Dept. of Commerce) 13
Burroughs Adding Machine Co. 
Butler, C.P. (Solar Physics Observatory, Cambridge) 
Byrd, Mary E. (Smith College Observatory) 
Cadmus, W.R. 
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Callery, J.D. (Pittsburgh Railway Co.) 14
Calvert, Mary R. (Yerkes) 
Cambridge Philosophical Society 
Cameron, M. (Curtiss Aeroplanes and Motors, Ltd.) 
Campbell, W.W. (Lick Observatory), 1904-1906 
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Campbell, W.W. (Lick Observatory), 1907-1909 15
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Campbell, W.W. (Lick Observatory), 1910 16
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Campbell, W.W. (Lick Observatory), 1911-1912 17
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Campbell, W.W. (Lick Observatory), 1913 18
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Campbell, W.W. (Lick Observatory), 1914 19
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Campbell, W.W. (Lick Observatory), 1915 20
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Campbell, W.W. (Lick Observatory), 1916-1919 21
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Canada (Astronomical Society of) 22
Cannon, Annie J. (Harvard College Observatory) 
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Cannon, J.B. (Ottawa Observatory) 23
Cape of Good Hope Royal Observatory 
Cargill, J.F. 
Carlin, Thomas H. 
Carmalt, Alice M. (University of Pittsburgh) 
Carnegie Foundation for Advancement of Teaching 
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Carnegie Institute of Technology 24
Carnegie Institute of Washington 
Carnegie, Louise W. 
Carnegie Steel Co. 
Carnegie Technical Schools 
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Carson and White Co. 25
Cater Electric Co. 
Carus, Paul (The Monist - The Open Court) 
Casey, Rev. Walter D. (St. Patrick's Rectory) 
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Cattell, J. McKeen (Popular Science Monthly) 26
Central District and Printing Telegraph Co. 
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Challinor, William 27
Chance Bros. And Co., Ltd. 
Chance, F. L. (Yale University) 
Chandler, C.F. (Columbia University) 
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Chant, C.A. (University of Toronto) 28
Chateau Freres and Cie 
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Chevreuse Observatory 29
Chollon, L. 
Church 
Civera University of Ebro 
E. Howard Clock Co., 1905 
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E. Howard Clock Co., 1906-1909 30
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Coast Survey 31
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Coblentz, W.W. 32
Coe College 
Cohn, Fritz (Pecher Institute) 
Coleman, George 
Columbia University 
Compton, Alfred G. (College of the City of New York) 
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Comstock, George C. (MIT Astronomical and Astrophysical Society) 33
Cocke, F. and Sons 
Cooper, W.J. 
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Cortie, Rev. A.L. (Stonyhurst College) 34
Concrete Steel Construction Co. 
Cotsworth, M.E. (Direct Calculators) 
Cottam, Vincent W. 
Cowperthwaite, M.F. (U.S. Senate) 
Cox, Harry w. Ltd. 
Coyne, John F. 
  Folder
Cramer Dry Plate Co. 35
Craven and Jackson 
Craver, Harrison A. (Carnegie Library) 
Crawford, Nettie J. 
Crerar (John) Library 
Cresson (George V.) Co. 
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Crew, Henry (Northwestern University) 17c1
Crommelin, A.C.D. (Royal Observatory) 
Cross, Charles P. (MIT) 
Crypt 
Cummings, Edith E. (Lick Observatory) 
Cummons, J.W. 
Cunningham, John W. 
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Curtis, Heber D. (Lick Observatory) 2
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Curtiss, Ralph H. (Lick - Detroit Observatory - Allegheny Observatory), 1905-1908 3
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Curtiss, Ralph H. (Lick - Detroit Observatory - Allegheny Observatory), 1909-1919 4
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Cushing, C.B. (Frick and Lindsay Co.) 5
Customs Treasury Dept. 
Dalby (R.H.) and Co. 
Daniel, Laccheus (Princeton University) 
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Danifot (University of California) 6
Danler and Cie 
Danner, F.J., Jr. 
Data 
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Davidson, George (University of California) 7
Davis, Alice E. 
Davis, Herman S. (International Geodetic Assoc.) 
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Davis, John K. 8
Davis, K.E. (University of Pittsburgh) 
Davis, Raymond C. (University of Michigan) 
Davis, Robert L. (Westinghouse) 
Davis, W.M. 
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Day, Arthur L. (National Academy of Science) 9
Day, David F. 
Day, George Parmly (Yale University) 
Deans of the University (University of Pittsburgh), 1913 
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Deans of the University (University of Pittsburgh), 1913 10
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Deans of the University (University of Pittsburgh), 1914 11
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Dempster, A. 12
Denison University 
Denton (Joseph Horne Co.) 
Derlodge 
Detroit Publishing Co. 
Dewey, John (Columbia University) 
Diden, J. Gordon 
Diks, A.W. 
Doberck, W. 
Dodge, Otis 
Dormtous, Charles (Westinghouse Electric) 
Dodd, L.E. (Bureau of Standards) 
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Doolittle, C.L. (American Philosophical Society) 13
Doolittle, Eric (University of Pennsylvania) 
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Doubleday-Hill Electric Co. 14
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Douglass, A.E. (University of Arizona) 15
Downs, Louis (the Associated Charities of Pittsburgh) 
Dudley, P.H. (New York Central and Hudson River Rail Road Co.) 
Dugan, Raymond S. (Princeton University Observatory) 
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Duncan, J.C. 16
Duncan, Robert K. (Mellon Institute of Industrial Research) 
Du Rig, A.H. 
Dwyer, Michael D. 
Dyson, F.W. (Royal Observatory of Edinburgh) 
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Eastman Kodak Co. 17
Ebert, A.G. (Technological Branch - U.S. Geological Survey) 
Eckls, F.H. (University of Pittsburgh) 
Eddington, A.S. (Observatory Cambridge) 
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Eder Construction Co., 1906 18
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Eder Construction Co., 1909 19
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Edinburgh (Royal Observatory) 20
Edward, George Co. 
Eggers, Edward E. (Carnegie Library) 
Eichelberger, W.S. (U.S. Naval Observatory) 
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Eimer and Amend 21
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Electric Storage Battery Co. 22
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Elston, Catherine (Western University of Pennsylvania) 23
Engelman, Wilhelm 
Equiley, John (College of the City of New York) 
Evens, P.B. (University of Cincinnati) 
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Excelsior Diary 24
Fagginger, A.C. 
Fales, E.N. 
Farrington, R.P. (School of Mines - University of Pittsburgh) 
Faulkner, Richard B. (Alumni Assoc. of Columbia University) 
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Faunce, M.D. (Republic Iron and Steel Co.) 25
Favaro International Astronomical Station of Carloforte 
Finley, John H. (College of the City of New York) 
Finndlick, E. Finlay 
Board of Fire Underwriters 
Fisher, G.C. 
Fisher, Henry (Standard Underground Cable Co.) 
Fitchett, H.W. 
Fleming, George T. 
Fleming, Williamina P. (Harvard College Observatory) 
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Flint, A.S. (Washburn Observatory University of Wisconsin) 26
Flowtow, A. 
Fock, Buchhandlung Gustav 
Fowler, A. (Royal College of Science) 
Fowler, Mary (Vassar College) 
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Fox, Phillip (Northwestern University), 1908-1911 27
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Fox, Phillip (Northwestern University), 1912-1913 28
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Fox, Phillip (Northwestern University), 1914 29
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Fox, Phillip (Northwestern University), 1919-1920 30
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French, H.W. Co. 31
Fric, Josef and Jan 
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Frost, A.E. (Western University of Pennsylvania), 1904-1907 32
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Frost, A.E. (Western University of Pennsylvania), 1908-1909 33
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Frost, A.E. (Western University of Pennsylvania), 1910 34
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Frost, A.E. (Western University of Pennsylvania), 1911 35
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Frost, A.E. (Western University of Pennsylvania), January-February 1911 17d1
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Frost, A.E. (Western University of Pennsylvania), March-April 1911 2
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Frost, A.E. (Western University of Pennsylvania), May-December 1911 3
  Folder
Frost, A.E. (Western University of Pennsylvania), 1912-1913 4
  Folder
Frost, A.E. (Western University of Pennsylvania), 1914 5
Frost, Edwin B. (Yerkes) 
  Folder
The Fullman Co. 6
Fulmer, Elmer E. 
Furness, Caroline E. (Vassar College Observatory) 
  Folder
Gaertner, William and Co., 1905-1913 7
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Gaertner, William and Co., 1914-1920 8
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Gale, Henry (University of Chicago) 9
Gallo. (National Astronomical Observatory) 
Gamble, A. (Sidney H.S.) 
Gauthier - Villars 
Gazetter Times (Pittsburgh) 
Genova (R. Instituto Idrografico) 
National Geographic Society 
  Folder
Geophysical 10
George, Rev. W. (Henry Geneva College) 
Gerish (James H. Rhodes and Co.) 
German Club of Pittsburgh 
  Folder
Gill, David 11
Gillespie, F.D. 
Githeng, C.E. (Franklin College) 
Gluncey, A. Estelle 
Golden and Crick 
Gopes, F. 
Gosden, Thomas (Western Union Telegraph Co.) 
Goulandris, E. (National Observatory of Athens) 
  Folder
Graduate Council of the University of Pittsburgh, 12
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Graduate Council of the University of Pittsburgh, 1912 13
  Folder
Graduate Council of the University of Pittsburgh, 1913 14
  Folder
Graduate Council of the University of Pittsburgh, 1914 15
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Graduate Council of the University of Pittsburgh, 1916 16
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Graduate Council of the University of Pittsburgh, 1917 17
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Graham, Ben G. (The High School, Greensburg, PA) 18
Gray, B. (War Dept.) 
Green, Henry J. 
Green, Stephen Co. 
Greenwood and Sons 
Grney 
Grosjean, Charles 
  Folder
Grossmann, E. 19
Gundersen, May 
Gunnell, L. (Smithsonian Institution) 
W. and L. E. Gurley 
Guthnick, P. 
Hadley (Yale University) 
Haeny, M. 
  Folder
Hagen, J.G. (Specola Vaticana) 20
Hall, Arthur W. (Scientific Co.) 
  Folder
Hale, George E. (Mt. Wilson) 21
  Folder
Halsapple, F.F. (Juniata College) 22
Hamerschlag (Carnegie Technical Schools) 
Hamilton, C.H. (Rasner and Dinger Co.) 
Hammer Dry Plate Co. 
Hammond, John (U.S. Naval Observatory) 
Hamy, M. 
Handgrove, M.R. (Pennsylvania Railroad) 
Harmon (St. John's College) 
The Harmsworth Encyclopedia 
Harper, W.E. (Dept. of Interior) 
Harris, L.H. (School of Engineering, University of Pittsburgh) 
Harris (Philip) and Co., Ltd. 
  Folder
Harper, W.E. (Dept. of Interior) 23
Hartmann (Astrophysikalishes Observatory, Potsdam) 
Hartwig 
Harwood, M. 
Hassel, Karl (School of Eng., University of Pittsburgh) 
Hasselberg, B. 
  Folder
Hastings, Charles (Yale University) 24
  Folder
Haussman, K. 25
Hawkers, Julia 
Hawkesworth, Alan S. (Carnegie Library) 
Hayford, John F. (Northwestern University) 
Haynes, E.S. (Laws Observatory) 
Hays, S. Mimis (American Philosophical Society) 
Hendrick, Henry B. (Nautical Almanac Office) 
  Folder
Heger, Mary Lee (University of California) 26
Henck, J.B. 
Hendrickson - Maytham Co. 
Henroteau, F. (Lick Observatory) 
Hepperger 
Herda, C. 
Herr, E.M. (Westinghouse) 
Herron, J.W. 
  Folder
Hertzsprang, Rjnar 27
  Folder
Hildebrandson, H.H. 28
Higer (A.), Ltd. 
Hinchman, Lydia S. (Maria Mitchell Assoc., Osceola) 
Hinks (The Observatory, Cambridge) 
Hirayama, Shin (University of Tokyo) 
Hirsch, William (American Steel and Wire Co.) 
  Folder
Histaling, S. 29
Hobe, A. (Lick) 
Holden, E.S. (West Point Military Academy) 
Holder, F. (University of Pittsburgh) 
Holland, W. 
Hollis, H.P. (Royal Observatory) 
Holmes, George S. (First Methodist Episcopal Church) 
N. Holmes and Sons 
Holmes, Rachel 
Holmes, Samuel 
  Folder
Hood, W.K. (Duquesne Fireproofing Co.) 30
Hoogewerff, J.A. (US Naval Observatory) 
Hoover 
Hopkins, L.S. (Kent State) 
Hopkins, M.M. (Smith College Observatory) 
Hough, S.S. (Royal Obs., Cape of Good Hope) 
Howard, F.B. (U.S. Naval Observatory) 
  BoxFolder
Hudson, Charles J. (Amherst College Observatory) 17e1
Huggins 
Humphreys, W.J. (U.S. Weather Bureau Office) 
Hundred (American Assoc. for Advancement of Science) 
Huntington (Wells- Fargo Co.) 
  Folder
Hussey, W.J. (Detroit Observatory) 2
  Folder
Hutchinson, C.F. (National Research Council) 3
Hutchinson, Robert 
Ihinohe, Naozo (Tokyo Astronomical Observatory) 
Ihlsenj, M.C. (Blairsville College) 
Imperial Academy of Sciences of St. Petersburg 
Innes, R.T.A. (Transvaal Observatory) 
  Folder
ION - Journal of Electronics, Astomistics, Ionology, Radioactivity and Baumchemistry 4
Royal Instituto Idrografic 
Italian Association for the Advancement of Science 
Jacob and Valentin 
Jacobs, I.W. (Northwestern mutual Life Insurance) 
Jacoby, Harold (Columbia University) 
  Folder
Jay, Alfred H. (Syrian Protestant College Observatory) 5
Jayne, J.L. (U.S. Naval Observatory) 
Jeffery Manufacturing Co. 
  Folder
Jennings, F.R. 6
Jeulsius, Louise F. 
H.W. Johns-Manville Co. 
Johnson, Anthony (Reed and Witting) 
Johnston and Co. 
Jonckhure, Robert 
Jones (Dept. of Commerce) 
  Folder
Jordan, F.C. (Yerkes Observatory) 7
Jursek, Carl C. 
  Folder
Kaeurpffert 8
Kapteyn, J.C. (Mt. Wilson Solar Observatory) 
Kauffman Bros. 
  Folder
Kayser 9
Keating, W.A. 
Keeler, James 
Keen, W.W. (Philosophical Society) 
Kehro, John 
Kellogg, Fred (Allegheny Co. Light Co.) 
Kennedy, J.E. 
  Folder
Keppel, T.P. (Columbia) 10
Kester, F.E. (University of Pittsburgh) 
Ketchuny, George (University of Pittsburgh) 
Keyser, C.J. (Columbia University) 
King (Dominion Observatory, Harvard College Observatory) 
  Folder
Kistler, R.L. 11
Kistner, Mark (St. Vincent College) 
Klages, G.W. 
Kloh, Skar. (University of Pittsburgh) 
Klotz (Dept. of Interior) 
Knopf, Otto (Sternwarte) 
L.E. Knott Apparatus co. 
  Folder
Knowles, Harry 12
Kobold, Hermann (Astronomische Nichrichten) 
Kobow, Hermann 
Koch, S. Marie (St. John's General Hospital) 
Konkoly, Nicolas (Royal Institute of Meteorology, Budapest, Hungary) 
Koon, E. (Observatory, Potsdam) 
Kopf, M.G. (Ralko Products Co.) 
  Folder
Kratzer and Co., 1904-1906 13
  Folder
Kratzer and Co., June 1907 14
  Folder
Kratzer and Co., July-December 1907 15
  Folder
Kucera, Otto (Observatory, Zagreb, Croatia) 16
Kurtz, Langvein and Swartz 
Kustner, F. (Sternwarte) 
Laekyn, William (Solar Physics Observatory, London) 
Lambert, R.C. (Carnegie Steel) 
Lampland, C.O. (Lowell Observatory) 
  Folder
Langley, S.P. (Smithsonian Institute) 17
Lau, H.E. (Sternwarte) 
Lauder, George 
Laves, Kurt 
Lawrence Paint Store 
Leavenworth, F.P. (University of Minnesota) 
Leavitt 
Lecointe, G. (Royal Observatory of Belgium) 
  Folder
Lee, Oliver J. (Yerkes Observatory) 18
  Folder
Leete, John B. (Carnegie Technical Schools) 19
Lefras, Gustave 
LeGoullon, P. 
Lehmann-Fillus 
Leisser, B. (Pittsburgh School of Design) 
Leland, O.M. (Astronomical Society) 
Leni, John F. 
Leon, Luis (Society of Astronomy, Mexico) 
Leonard, F.C. (Leonard Observatory) 
  Folder
Leuchan, H. (Sydney Observatory) 20
Leuschner, Armin O. (University of California) 
  Folder
Lewellyn, C. G. 21
Libert, Lucien 
Library Bureau 
Lick Observatory 
Liedki, Richard 
Lincoln, Paul M. 
Ling, George (Columbia University) 
  Folder
Linhart, S.B. (Western University of Pittsburgh - Office of Secretary) 22
  Folder
Little, Frank B. (U.S. Naval Observatory) 23
Lockhart, James 
  Folder
Lockwood, W. H. (S.F. Bowser Co.) 24
Lohse (Observatory Astrophysikalisches, Potsdam) 
Long, W.F. 
Longmans, Green and Co. 
Lord, H.G. (Emerson McMillin Observatory, Ohio State) 
  Folder
Lovett, Edgar Odell (Princeton Observatory) 25
Lowell, Percival (Lowell Observatory, Arizona) 
Ludendorff (Observatory Astrophysikalisches, Potsdam) 
Ludwig, W.H. 
  Folder
Lumiere N. (America Co., Ltd.) 26
Lundin, C.A.P. (Alvin Clark and Sons Corp.) 
Lunt, J. 
Luterancik, John P. (St. Vincent's Seminary) 
Lyon, J.L. 
  Folder
van Maanen, Adrian (Yerkes Observatory) 27
  Folder
MacFarlane, James R. (Carnegie Museum) 28
MacMillan Co. 
Maddille, James (International Latitude Observatory) 
Magill, Endora 
Magnus, Nyren 
Magvar Tudomanyos Akadimia (Budapest) 
  Folder
Mamaux Sons 29
Manhattan Electrical Supp. 
Mann, Ira A. 
Marcus, Alexander (College of the City of New York) 
  Folder
Mars (a poem) 30
Marsh, Charles E. (Atchinson, Topeka,Santa Fe Railway) 
Marshall Bros. 
Marshall, R. (U.S. Geological Survey) 
Marti, C. 
Glenn L. Martin Co. 
Martin, H.S. (War Dept) 
Martin, John F., Rev. 
Martin, William C. (John A. Brashear Co.) 
  Folder
Marwick, E.E., Col. 31
Marzolo, P. 
Mason, H.D. 
Mason, William A. (Philadelphia Board of Education) 
  Folder
Maunder, Thomas F. (British Astronomical Association) 32
Maury, J.W. Draper (Harvard Club of N.Y.) 
May, Gertrude B. 
The May Lumber Co. 
Mazelle (Maritime Observatorium) 
McAllister (Electric Service Supplies Co.) 
  Folder
McAteer, Charles (Harvard Observatory) 33
McCasland, May 
Oliver McCLintock Co. 
McConway, William 
  BoxFolder
McCormick, S.B. (Western University of Pennsylvania), 1905-1909 17f1
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McCormick, S.B. (Western University of Pennsylvania), 1912 2
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McCormick, S.B. (Western University of Pennsylvania), 1913-1915 3
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McCormick, S.B. (Western University of Pennsylvania), 1916-1919 4
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McCoutrey (Boggs Buhl) 5
McDiarmid, R.J. (Dept. of Interior) 
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McDowell, J.B. 6
McDowell (J.A. Brashear Co.), 1905-1911 
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McDowell (J.A. Brashear Co.), 1912-1920 7
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McGahan (Westinghouse) 8
McGee, Anita A. 
McGill, M.A. (U.P. Theological Seminary) 
McGuiness (American Warming and Ventilating Co.) 
McKinley, A.E. 
McKnight, T.H.B. (University of Pittsburgh) 
  Folder
McLane, R. 9
McLean, Maggie 
McMaster, Jessie 
McNaugher, John (Pittsburgh Theological Seminary) 
McNees (Geologic and Topographic Survey) 
McNish, Thomas 
  Folder
McPherson, William D. (The American Astronomer) 10
McWilliams, S.E. 
Meals, Emma 
Mecklin, J.M. (University of Pittsburgh) 
  Folder
Mees, C.E.K. (Eastman Kodak), 1914-1915 11
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Mees, C.E.K. (Eastman Kodak), 1916-1917 12
Meese, L.H. 
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Meggers, W.F. (Dept. of Commerce) 13
  Folder
Mendenhall, C.E. (National Research Council, Library Bureau) 14
Meikle, Anna E. (Case School of Applied Medicine) 
Mellon, Rachel H. 
Mellor, Lewis L. (Detroit Observatory) 
Merrill, Paul W. (U.S. Bureau of Standards) 
Mershon, Ralph 
Mesta Machine Co. 
Metcalf, Joel (Winchester Unitarian Society) 
Meteorological Observatory of the Imperial University 
  Folder
Miles, J. Walter (Westinghouse) 15
Millas, Jose Carlos (National Observatory - Cuba) 
Miller, G. 
Miller, G.A. (University of Illinois) 
  Folder
Miller, John A. (Swarthnore College), 1906-1912 16
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Miller, John A. (Swarthnore College), 1913-1914 17
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Miller, John A. (Swarthnore College), 1915-1916 18
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Miller, John A. (Swarthnore College), 1917-1919 19
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Millikan (National Research Council) 20
The Millionaire 
Miscellaneous 
Mitchell, S.A., 1908-1914 
  Folder
Mitchell, S.A., 1915 21
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Mitchell, S.A., 1916-1917 22
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Mitchell, S.A., 1918-1920 23
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Mitchell, S.A., 1906 24
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Mitchel, Walter M. (Haverford College Observatory) 25
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Moeller, Herman (J.M. Gusky Orphanage and Home) 26
Monk, George S. (Yerkes Observatory) 
Society of the Observatory of Mont Blanc 
Montova 
Moore, H.K. 
Morning, Ober (Pottstown High School) 
Morecroft, J. Arnold (Pratt Institute) 
Morgan, H.R. (U.S. Naval Observatory) 
Morris, Brown Co. 
Morrison, George (United Engineering and Foundry Co.) 
Morschhauser, W.A. 
Moseley, E.L. 
  Folder
Moulton, F.R. (University of Chicago) 27
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Mourashkinsky, Basil 28
Oscar Muller Co. 
Murdoch, Kerr Co. 
Mutte, Henry 
National Astronomical Observatory (Tacubaya, Mexico) 
Naegauirala, R.D. 
Nail, Mary C. 
National Academy of Sciences 
National Press Bureau 
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National Radiator Co. 29
National Research Council 
Nature Magazine 
U.S. Naval Observatory 
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Neodymium 30
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Neodymium 31
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Nernst Lamp Co. 17g1
Newall, H.F. (Solar Physics Observatory, Cambridge) 
Newcomb, S. 
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New Era Printing Co., 1907-1908 2
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New Era Printing Co., 1909 3
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New Era Printing Co., 1910 4
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New Era Printing Co., 1915-1917 5
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New Era Printing Co., 1919-1920 6
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New Hampshire State Library 7
New York Public Library 
Observatory of Nice 
Nicholson Printing co. 
Nicola, F.T. (Schenley Farms Co.) 
Norris 
Northwestern University 
Nutting, P.G. (Westinghouse) 
Nyland, A.A. (Observatory of Utrecht) 
  Folder
Observatory Committee 8
Olcott 
Oliver, George F. (U.S. Senate) 
Olivier (University of Virginia) 
One Hundred 
Optical Instrument Monthly 
Otis Elevator Co. 
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Ott, F.L. 9
The Pacific Express Co. 
Paddock, G.F. (Mills Observatory Expedition) 
Painter, George E. 
Palmer, Charles 
Palmer, Harry M. 
Palmer, Margaretta 
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Pi Co-op (Parallax Committee) 10-14
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Park, J.A. 15
Park, J.L. (Western University of Pennsylvania) 
Parker, M.H. (Dept. of Interior) 
Parker, F.H. (Dept. of Interior) 
  Folder
Parkhurst, Henry (Superior Court) 16
Parkhurst, J.A. (Yerkes Observatory) 
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Pastorelli and Rapkin, Ltd. 17
Patterson, W.H. (Westinghouse) 
Paulson, W.S. 
Payne, William W. (Goodsell Observatory of Carleton College) 
Pearl, Raymond (National Research Council) 
  Folder
Peck, Henry A. (Syracuse University) 18
Peyram, George B. (Columbia University) 
Peifer, Charles J. (J.A. Brashear Co.) 
Pennsylvania Railroad Co. 
Pennywitt, Henry (Dept. of Agriculture) 
  Folder
Perrine, C. (Astronomical Observatory - Argentina) 19
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Pessler, A. 20
Peters 
Petersen, Max (University of Wisconsin) 
Pfund, A.H. (Johns Hopkins University) 
  Folder
Phillips, Fracis (University of Pittsburgh) 21
Phillips, Theodore 
Photographic Astronomy 
  Folder
Pickering, E. (1900-1911,1912-1917) (Harvard College Observatory) 22-30
Pickering, W. (Harvard College Observatory) 
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Pickering, W. (Harvard College Observatory) 31
Pierpont, James 
Pellou, J.L. (Dept. of Public Works) 
Pillsbury, J.L. (National Geographic Society) 
  Folder
Pitman (Swarthmore College) 32
Pittsburgh and Allegheny Telephone Co. 
Pittsburgh Calcium Light and Film Co. 
Pittsburgh Electrical and Machine Works 
Pittsburgh Fire Extinguisher Co. 
Pittsburgh Heating Co. 
Pittsburgh Iron and Wire Works 
Pittsburgh Map 
Pittsburgh Printing Co. 
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Plaskett, J.S. (Dominion Observatory, Victoria, South Carolina), 1907-1910 33
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Plaskett, J.S. (Dominion Observatory, Victoria, South Carolina), 1911-1912 34
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Plaskett, J.S. (Dominion Observatory, Victoria, South Carolina), 1913-1914 35
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Plaskett, J.S. (Dominion Observatory, Victoria, South Carolina), 1915-1917 17h1
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Plaskett, J.S. (Dominion Observatory, Victoria, South Carolina), 1919 2
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Plassman, J. 3
Pluvinel 
Polar Trails 
Poole, D. Lewis (Royal Societies Club) 
Poor, Charles (New York Academy of Sciences) 
Poor, John (Shattuck Observatory) 
Popular Astronomy 
  Folder
Porter, Edwin K. (City Deposit Bank) 4
Porter, H.B. (The Scientific Shop) 
Porter, H.K. 
Porter, Jermaine G. (Cincinnati Observatory) 
Postal Telegraph Cable Co. 
Post Master 
Pratt, W.H. 
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Price, P.W. (County Engineers Office) 5
Priest, Mame S. (U.S. Bureau of Standards) 
Presho, C. (Caton Technical Schools) 
Pritchett (Carnegie Foundation) 
Professors 
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Proof 6-7
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Purdy, Ross 8
Quimby, Alden 
Le Radium (Physics Journal) 
Ralko Products Co. 
Rambaut, Arthur A. (Radcliffe Observatory) 
Ramsey, Charles N. (Equitable Life Assurance Society of the U.S.) 
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Rasner and Dinger Co. 9
Rayburn and Bates 
Raynaud, Michel 
Rea, James H. 
Director (Real Observatory) 
Red Cross 
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Redden, J.M. 10
Reed and Witting - Stationers 
Reich, M. (General Engineering and Contracting Co.) 
Reiche, Louise 
Reid, A.M. 
Reimer, George (Verlagsbuchhandlung) 
  Folder
Reiss, R. 11
Remsen, Ira (Johns Hopkins University) 
Reports 
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National Research Council 12
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Ricco, A. (Royal Observatory of Catania) 13
Rich, J. and G. 
Ridgeway, Frank (U.S. Dept. of Agriculture) 
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Riefler, Clemens (Weather Bureau) 14-15
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Rifenburg, F.C. (Phila. Typewriter Supply Co.) 16
Riggenbach, Albert (Astronomisch - Meterorlogische Anstalt) 
Rines, David (Coast and Geodetic Survey) 
  Folder
Ristenpart, F. (Astrological Observatory Casilla) 17
Ritchey, G.W. (Solar Observatory, Mt. Wilson, CA) 
Ritter and Flebbe 
Robertson, David (Pittsburgh Golf Club) 
Rockwell, W.W. 
Roddi, Auguste 
Roe, E.D. (Syracuse University) 
Romeiki Inc. 
Rosedale Foundry and Machine Co. 
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Ross, Frank (International Geodetic Assoc.), 1907-1909 18
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Ross, Frank (International Geodetic Assoc.), 1910 19
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Ross, Frank (International Geodetic Assoc.), 1911-1913 20
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Rowland, K. (Western University of Pennsylvania) 21
Royal Typewriter Co. 
Royal Astronomical Society, London 
Royal Observatory, London 
Rumrill, H.B. (Pennsylvania Railroad) 
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Russell,Henry Norris (Princeton), 22
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Russell,Henry Norris (Princeton), 1911 23
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Russell,Henry Norris (Princeton), 1912 24
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Russell,Henry Norris (Princeton), 1913 25
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Russell,Henry Norris (Princeton), 1914 26
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Rust, Frances 27
Sabisee, Wallace (War Dept.) 
Sanford, Fernando (Stanford University) 
Sayer, Luella (Dearborn Observatory) 
Saylor, E.B. (Western Union Telegraph Co.) 
Scaife, Lucien 
  Folder
Scandrett, Thomas (Dept. of Public Safety) 28
Schapper, H. 
Scheiner, J. 
Schiaparelli, Giovanni (Observatory of Brera-Milan) 
Schimmack, P.K. 
Schlesinger, Frank (Publications list) 
Schoenberg, E. 
Schoenlein, O.G. (Emmanuel Lutheran Church) 
Scholer, Eva 
Schoer, Richard (Sternwarte - Hamburg) 
  Folder
Schott Genossen - Jena, Germany 29
Schoyer, A.M. (Pennsylvania Lines) 
Schrocter, F.H. (Christiana Observatory - Norway) 
Schumacher, Elsa 
  Folder
Schuster, Arthur (Manchester, England) 30
Schwab, J.C. (Yale University Library) 
Schwarzchild, R. (Astrophysikalisches Observatory) 
  Folder
Schwob, Adolphe, Inc. 31
The Science Press 
Scientific American Compiling Dept. 
Scientific Materials Co. 
Scott, Charles (Westinghouse) 
Seares, F.H. (Solar Observatory) 
Seckendorff, M.G. 
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Secretary's Office (University of Pittsburgh), 1910-1914 32
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Secretary's Office (University of Pittsburgh), 1915-1919 33
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See, F.J.J. (Naval Observatory) 34
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Seed, Dry Plate Co. 35
Seelinger, H. (Sternwarte - Munchen) 
Seibel, George (Pittsburgh Gazette) 
Shapley, Harlow (University Observatory - Princeton 
  Folder
Sharman, George H. 36
Shattuck (8th International Geographic Congress) 
Shinjo, Shinto 
Sidgreuves, Walter (Stonyhurst College) 
Sies, R.F. (School of Education, University of Pittsburgh) 
Simmons, Guy (Independent Agency, Bureau of Statistics) 
Simpson 
Singer, G. Harton 
  BoxFolder
Slipher, V.M. (Lowell Observatory, Flagstaff, Arizona) 17i1
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Slocum, Frederick (Yerkes), 1909-1914 2
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Slocum, Frederick (Yerkes), 1915-1919 3
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Smalley, R.E. 4
Smiley, Charles (Allegheny Post Office) 
Smith, A.G. 
Smith, Charles (Fire Insurance) 
Smith Edwin (Dept. of Commerce and Labor, Coase Geodetic Survey) 
Smith, Elliott (Cincinnati Observatory) 
Smith, J.M. 
Smith, Mason F. (Yale University) 
Smith, S.B. (Prism Glass Co.) 
Smith, Walter 
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Smithsonian Institution 5
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Snow, Benjamin W. (University of Wisconsin) 6
Snyder, Antes (Pennsylvania Railroad) 
Snyder, M.B. (Philadelphia Observatory) 
La Societe Imperiale des Naturalistes de Moscow 
  Folder
Solar Rotation 7
Solyom, Herbert (Yerkes Observatory) 
Somers, Fitler and Todd Co. 
Southall, James P.C. (Alabama Polytechnic Institute) 
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Spencer Lens Co. 8
Spieth, William Spindler and Hoyer 
Springer 
Spurgeon, John J. (Public Ledger) 
Standard Roller Bearing Co. 
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Standards-U.S. Bureau of 9
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Stauernagel, Oscar 10
Stebbins, Joel (University of Illinois) 
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Stechert, G.E. Co. 11
Stellar Parallax 
Stellar Spectra 
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Hamburger Sternwarte 12
Stetson, H.F. (Yerkes) 
B.F. Stevens and Brown - Trafalgar Square 
Stevens, Robert L. (Trinity Rectory) 
Stevenson, Edward A. 
Stevenson and Foster Co., Pittsburgh 
  Folder
Stewart, De Lisle 13
Stewart Douglas (Carnegie Museum) 
Stewart, Marie 
Stewart R. (Western University) 
Stewart R. Mildrum (Dominion Observatory) 
Stocker, Florence J. (Radcliffe College) 
Stockhausen and Sons 
  Folder
Stone, Ormond (University of Virginia) 14
Stratton, F.J. M. (Solar Physics Observatory - Cambridge University) 
Straub, Max V. 
  Folder
Stroingren (Observatory Copenhagen) 15
Stroobant, P. (Royal Observatory of Belgium) 
Struve, D.H. (Sternwarte Konigliche) 
Staub, John 
John Stulen and Sons 
  Folder
Stupakoff, S.H. 16
Supplee, C.W. 
Sutton, Psyche Rebecca (The Daily Reporter) 
Swope, E.F. (William Mitchell Printing Co.) 
Switchboard 
System, Fitting Co. 
Tacchini, Pietro 
Taggart and Yerxa 
  Folder
Tallock, John (Wall Street) 17
Taylor (University of Cincinnati) 
Taylor and Dean (Pittsburgh Iron and Wire Works) 
Taylor, James (Vassar) 
Tebbcott, John (Observatory-Wales) 
Technical World Magazine 
Teller, Sidney (Irene Kaufmann Settlement) 
Templeton, Alex 
Terschoffel, A. (Institute of France) 
Tetens, Otto 
  Folder
Thaw, Benjamin 18
Thaw, H.K. 
  Folder
Thaw, Stephen Dows 19-22
  Folder
Thiersky, G.W. (Carnegie Institute of Technology) 23
Thomson, Andrew 
A.F. Thompson and Co., Boston, MA 
Thompson, Henry S. (Harvard) 
Thompson, Mary 
Thompson, Mrs. William R. 
  Folder
Thurston Prep School 24
Tickel (University of Pittsburgh) 
Tillyer, Edgar D. (U.S. Bureau of Standards) 
Times 
  Folder
Tittmann, O.H. (Coast and Geodetic Survey) 25
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Todd, D. (Amherst College Observatory) 26
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Todd, James (Sterling Varnish Co.), 1911 27
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Todd, James (Sterling Varnish Co.), 1912 28
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Todd, James (Sterling Varnish Co.), 1913 29
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Tombo, Rudolf, Jr. (Alumni Council of Columbia University) 30
Toulouse, Univ. de 
Townley, Sidney D. (Stanford University) 
  Folder
Tozer, R.S. 31
Tracht (University of Chicago) 
Trinks, W. (Carnegie Technical School) 
Trubner, Karl J. 
Truman, O.H. (University of Iowa) 
  Folder
Trumpler, R. 32
  Folder
Tucker, R. H. (Lick Observatory) 33
Turk, J.C. (A. S. Wilson Co.) 
Turner, Arthur B. (college of the City of New York) 
Turner, Flora 
Turner, H.H. (University Observatory - Oxford, England) 
  Folder
Tyler (Ensign Manufacturing Co.) 34
Tyson (University of Pittsburgh) 
Ukiah Observatory 
Ullman, B.L. (University of Pittsburgh) 
  Folder
Union (International Astronomical Union) 35
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Union National Bank 17j1
Union Observatory (Johannesburg) 
United Presbyterian 
United Press Service 
United States Express Co. 
University of Chicago (Library) 
University of Chicago Press 
University of Michigan (Library) 
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University of Pittsburgh 2
  Folder
University Professors, American Assn. Of 3
Updegraff, Milton (U.S. Naval Observatory) 
Vahlen (Preussische Akademie) 
Valente, John 
Vallot, J. (Observatory of Mont Blanc) 
Van Bresbroeck G. (Yerkes) 
Very, Frank (Westwood Astrophysical Observatory) 
Vockrodt 
Voigtlander and Son (Optical Works) 
  Folder
Voss Sortiment 4
Voorhees, Oscar 
Voute, J. (Royal Observatory) 
Wadsworth 
Walcott, C.D. (Smithsonian) 
Wales Visible Adding and Listing Machine 
Walker, A. (U.S. Naval Observatory) 
  Folder
Walker, C.H. (Editor of Ion) 5
Walker, Gilbert F. (Indian Observatory - Calcutta) 
Walker, H.L. (Dollar Savings Bank) 
Walkey, O.R. 
Wallace, Daniel H. 
  Folder
Wallace, Isabel 6
Wallace, John Wallace, R. James (Yerkes) 
Wallin, Sven 
Walter, G. 
Waltham Watch Co. 
War Dept. 
War Dept. (Office of Chief Signal Officer) 
  Folder
Ware, Louise (Yerkes) 7-11
  Folder
Warner and Swasey Co. 12-14
  Folder
Weimck 15
Welch, Willia Y. (Clarion State Normal School) 
Weld, Le Roy (Coe College) 
Wells Fargo and Co. 
Wendell, O.C. (Harvard College Observatory) 
Wenley, R.M. (University of Michigan) 
West, Andrew (Princeton) 
West, Laura 
Western Union Telegraph 
Westinghouse, Church, Kerr and Co. 
  Folder
Westinghouse Electric and Manufacturing Co. 16-19
  Folder
Westinghouse Machine Co. 20
Wehterbee, Weston 
Wettach, James 
White, Arthur 
White, James F. (Publishers) 
White, Jesse (University of Pittsburgh) 
White, Scott A. 
White, William Charles (University of Pittsburgh) 
  Folder
Whitney, Mary 21
Whitney, W.R. 
Whittmer, Clara 
Whyte, Charles (United Free Church) 
Wicks, Mark (Thorton Heath) 
  Folder
Wilkins, Mary 22
Willard, Elisa (Carnegie Library) 
Willard, Storage Battery Co. 
Williamson, Robert (Madison Wisconsin) 
Wilsing, F. 
  Folder
Wilson, D.J. (Case School of Applied Science) 23
Wilson, E.B. (National Academy of Sciences) 
Wilson, Herbert C. (Carleton College) 
H.W. Wilson Co. 
Wilson, Ralph (Goodsell Observatory - Carleton College) 
  Folder
Windsor, William 24
Winters, Edna (Indiana Normal School) 
Wirth, Andrew G. 
Witmer, Samuel 
Wittig, Gustav (University of Alabama) 
  Folder
Wolf, Max 25
Womer, P.P.(Washburn College) 
Wood, Harry O. (National Research Council) 
Wood, R.W. (Johns Hopkins University) 
Woods, Harry I. (Washburn College) 
  Folder
Woodward, R.S. (Carnegie Institute of Washington) 26
  Folder
Woodwell, Joseph F. 27
Worth, S.D. (Dept. of Commerce and Labor) 
Wrightson, E.H. (Allegheny Loan and Trust Co.) 
  Folder
Yale University 28
YMCA 
Young, Anne (Mt. Holyoke College) 
Young, Charles Augustus (Princeton) 
  Folder
Young, R.K. (Dept. of Interior) 29
Young, S. Edward (Second Presbyterian Church) 
  Folder
Ziss, Carl 30
Zenith Stove and Heater Co. 
Zenthess, H.G. (Videnskabernes Selskab) 
Observatory of Zi-Ka-wes 
Zwillinger, Max (Crown Optical Co.) 

Addendum - Personal Correspondence 

  BoxFolder
Aitken, Robert G. (Lick Observatory, Hamilton, CA), September 6, 1901; June 5, 1902 17j31
Albrecht, Theodore, January 4, 1900 
Arnand, Joseph J. (New York), March 26, 1900; March 24, 1901 
Barnard, Edward E. (Yerkes Observatory), April 16, 1900; February 14, 1901 
Barrett, S.B. (Yerkes Observatory), January 13, 1903-March 31, 1903 
Bauer, George N. (New York), January 4, 1900 
Burkhalter, Charles (Cabot Observatory), March 17, 1900 
  Folder
Campbell, William W. (Lick Observatory), August 21, 1900-March 11, 1903 32
Chase, F.L. (Boulder, CO), June 16, 1903; June 22, 1903 
Chester, C.W. (Naval Observatory), April 3, 1903 
Davis, Herman (Gaithersburg, MD), February 11, 1900-January 3, 1903 
Davroton E. (San Francisco), March 13, 1900; March 20, 1900 
  Folder
Edwards, Frank V. (US Coast and Geodetic Survey), May 2, 1900; November 7, 1900 33
Ehrenberg, Frederick (New York), June 27, 1900 
Ellerman, Ferdinand (Yerkes Observatory, Williams Bay, WI), March 13, 1900; March 20, 1900 
Gildein, Otto von (San Francisco), April 3, 1900-July 5, 1900 
  Folder
Hale, George E. (Yerkes Observatory), July 17, 1899-Ocotber 18, 1901 34
Hartman, T. (Artrophys Observatory, Postsdam), March 19, 1900 
Hinks, Arthur (The Observatory, Cambridge), June 17, 1903 
  Folder
Jacoby, Harold (Astronomical Observatory, Columbia University, New York), January 24, 1900-December 9, 1901 35
Jesse, R.H. (University of the State of Missouri, Columbia, MO), April 26, 1901 
Jordon, David S. (Lelaw Stanford Junior University, Stanford University, CA), December 7, 1901 
Kreatr, H. (Keil, Germany), September 15, 1901 
  BoxFolder
Leuschner, Armin O. (Students Observatory, University of California), March 16, 1900-November 17, 1900 181
Liebisch, B. (Leipzig, Germany), August 21, 1900 
Murdock Press (San Francisco), June 6, 1901 
Parkherst, John A. (Marengo, IL), December 1, 1899-July 4, 1900 
Phipps, S.C. (Berkley, CA), April 1, 1900-May 27, 1900 
Pritchett, Henry Smith (Massachusetts Institute of Technology), March 13, 1900-April 23, 1901 
Porter, J.S. (Cincinnati Observatory), June 8, 1900 
Preston, E.D. (Washington, DC), March 14, 1900 
  Folder
Rees, J.K. (New York), December 1, 1899-April 7, 1903 2
Ritchey, Alfeda (Lake Geneva, WI), December 27, 1901 
Rogers, A.O. (San Francisco), November 27, 1900 
  Folder
Smith, Edwin (US Coast and Geodetic Survey, Washington), January 15, 1900-May 23, 1901 3
Trel, T.R. (Astronomical Society of the Pacific, San Francisco), February 14, 1901-October 26, 1901 
  Folder
Townley, Sidney D. (Astronomical Society of the Pacific, Berkley, CA), January 1, 1900-July 6, 1906 4
Treasury Department, Office of the Coast and Geodetic Survey, Washington, DC, June 4, 1901 
Tucker, R.H. (Lick Observatory), January 30, 1900 
Twitchell, Edward W., January 31, 1900-September 1, 1900 
U.S. Naval Observatory, Washington, DC, May 9, 1901 
Wanach, B. (Postscharn, Germany), June 29, 1900 
Wilczynski, E.J. (Berkley, CA), May 23, 1900-August 11, 1900 
Williamson, E.B. (Bluffton, Indiana), April 6, 1900 
Woodward, R.S. (Columbia University), May 20, 1901 

Personal Correspondence to Schlesinger 

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Camerer, Emile (New York), July 23, 1901 185
Davis, Herman (Washington, DC), July 7, 1900; May 1, 1901 
Flessner, Herman (New York), March 8, 1900 
Frank, Rose (New York), April 11, 1900; May 30, 1900 
Horpham, Flora E. (New York), February 9, 1900-March 31, 1902 
Hirsch, Mabelle, February 8, 1900 
  Folder
Jones, Cecil K. (Fowler, CA), May 15, 1900 6
Kanser, Edwar (Germany), December 5, 1899; March 30 1901 
Ling, George H. (Wesleyan University, Middletown, CT), November 5, 1900-September 22, 1901 
  Folder
McAdie, Alexander (U.S. Weather Bureau, San Francisco), May 16, 1901 7
Miller, C.W. (San Francisco), January 30, 1900-January 26, 1901 
Mitchell, S.A., March 10, 1901-August 2, 1901 
Nesbitt, Scott (Washington, DC), May 8, 1901 
Pritchett, Henry S. (Massachusetts Institute of Technology), May 2, 1901 
  Folder
Ritchey, Elfreda L. (Williams Bay, WI), June 12, 1899-May 2, 1901 8
Rogers, A.O. (San Francisco), January 11, 1900-March 13, 1901 
Sayuer, Mrs. J. V. (Williams Bay, WI), March 19, 1903 
  Folder
Schlesinger, Emanuel and Alice, October 23, 1900-June 16, 1903 9
Schlesinger, Gus, Arnelia, Gaby and Mignon (New York), May 4, 1900-December 1, 1901 
Schlesinger, Joe (New York), March 26, 1901 
Schlesinger, Minnie (New York), June 5, 1903 
? (U.S. Naval Observatory), September 29, 1900 
? (Observatorie Astronomique G. Metérologique, Lyon, France), March 13, 1901 

Personal Correspondence from Schlesinger 

  BoxFolder
Kirkpatrick, J. B. (New Brunswick, NJ), November 10, 1900 1810
Schlesinger, Minnie. (New York), October 19, 1899 

Personal Correspondence to Eva Schlesinger and Frank Jr. 

  BoxFolder
Davis, Coreita R. (Washington, DC), July 10, 1900 1811
Davis, Helen L (Columbia University, New York), c. 1901 
Harpham, Flora E. (New York), April 30, 1901 
Hirsch, B.S. [Eva's father], March 13,1900 
Kayuk, S., April 8, 1901 
Kelton, Genevieve (Ventura, CA), with enclosure to Frank Jr. April 9, 1901 
? [Eva's Grandfather], April 14, 1901 
? Sue., April 15, 1901 

Subseries  7. Heber D. Curtis, 1916-1930 

Scope and Content Notes

Heber D. Curtis was Director from 1920-1930. His field of interest was solar eclipses and stellar spectroscopy. He took part in eleven eclipse expeditions, five while he was Director of Allegheny Observatory. Talented in the construction and operation of scientific instruments, he built a machine shop as well as precision instruments. Dr. Curtis left in 1930 to become Director of Observatories of the University of Michigan.

  BoxFolder
Ac-Am 18417
  Folder
Ait 418-419
  Folder
Alb-Alt 420
  Folder
Alu-American Association 421
  Folder
American Association F 422
  Folder
American Association of American Re 423
  Folder
American, Re 424-426
  Folder
American, Ro-Astron 427
  Folder
Astrop-Bab 428
  Folder
Bac 429-433
  Folder
Bai-Ban 434
  Folder
Bar 435
  BoxFolder
Bau-Beal 19436-440
  Folder
Bras-Bri 441
  Folder
Bro-Bry 442
  Folder
Buf-Bury 443
  Folder
Burn 444
  Folder
Burt-Campbell, J 445
  Folder
Campbell, W 446-449
  Folder
Car 450
  Folder
Cha 451
  Folder
Chi-Coa 452
  Folder
Col-Com 453
  Folder
Con-Cox 454
  Folder
Cr-Cur 455
  Folder
Cut-Din 456
  Folder
Cir-Dodd 457
  Folder
Dodw 458
  Folder
Dol 459
  Folder
Dom-Dr 460
  Folder
Du 461
  Folder
Ea 462
  Folder
Ec 463
  Folder
Ed-Em 464
  Folder
En-Fa 465
  Folder
Fe-Fox, M 466
  Folder
Fox, P 467
  Folder
Fra 468
  Folder
Fre-Fu 469
  BoxFolder
Ga 20470
  Folder
Gi-Go 471
  Folder
Gr 472
  Folder
Hah-Ham 473
  Folder
Har-Has 474
  Folder
Hau-Hef 475
  Folder
Hei-Hen 476
  Folder
Hi-Ho 477
  Folder
Hu 478
  Folder
Hy 479
  Folder
Intel 480-484
  Folder
Io-Jar 485
  Folder
Jaf-Ju 486
  Folder
Ka-Ki 487
  Folder
Ki-Kn 488
  Folder
Ko-La 489
  Folder
Le 490
  Folder
Lib-Lin 491
  Folder
Lio-Ll 492
  Folder
Lo-Lu 493
  Folder
McA-McDon 494
  Folder
McDow 495-496
  Folder
McF-Mac 497
  Folder
Marr 498
  Folder
Mars-Mart 499
  Folder
Mas-Meg 500
  BoxFolder
Meh-Merria 21501
  Folder
Merril-Mie 502
  Folder
Mil 503-516
  Folder
Min-Mit 517
  Folder
Mit 518-519
  Folder
Mon-Moo 520
  Folder
Mor-Nac 521
  Folder
National, Ac 522
  Folder
National, AS-National, S 523
  Folder
Natu-New 524
  Folder
New, E 525
  BoxFolder
New, E 22526
  Folder
New, K-O'd 527
  Folder
Og-Ou 528
  Folder
Pa 529
  Folder
Pe 530
  Folder
Ph-Pitt 531
  Folder
Pittsburgh 532
  Folder
Pl-Poo 533
  Folder
Poo 534
  Folder
Pop 535
  Folder
Por-Pu 536
  Folder
Ra-Re 537
  Folder
Ri-Rod 538
  Folder
Rot 539
  Folder
Roy-Ru 540
  Folder
Sa-Sch 541
  Folder
Schl 542-550
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Schl 23551-556
  Folder
Science 557
  Folder
Scient 558
  Folder
Sch-Shan 559
  Folder
Shap 560-561
  Folder
She-Si 562
  Folder
Sli 563
  Folder
Slo-Su 564
  Folder
So-Steb 565
  Folder
Stec-Steu 566
  Folder
Sto 567
  Folder
Stra 568
  Folder
Stre 569
  Folder
Sw 570
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Sy-Te 571
  Folder
Tha 572-574
  Folder
Th-Thi 575
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Tho-Tr 24576
  Folder
Tu-United, P 577
  Folder
U.S., B-U.S., C 578
  Folder
U.S., G-U.S., N 579
  Folder
U.S., R-Van, M 580
  Folder
Van, R 581
  Folder
Vas-Ve 582
  Folder
Vo-Ward 583
  Folder
Warn-Weste 584
  Folder
Westi 585
  Folder
Wh-Wra 586
  Folder
Wri 587-589
  Folder
Ya-Yr 590
  Folder
Yw-Yu 591
  Folder
University of Pittsburgh, A-Bus 592
  Folder
University of Pittsburgh, Bus 593-598
  Folder
University of Pittsburgh, Bud-Cat 599
  Folder
University of Pittsburgh, Cha 600
  BoxFolder
University of Pittsburgh, Cha 25601
  Folder
University of Pittsburgh, Cha-Chi 602
  Folder
University of Pittsburgh, D. 603
  Folder
University of Pittsburgh, E-G 604
  Folder
University of Pittsburgh, H-K 605
  Folder
University of Pittsburgh, M-Seco 606
  Folder
University of Pittsburgh, Secr 607-611
  Folder
University of Pittsburgh, Si-Su 612
  Folder
University of Pittsburgh, T-Z 613

Subseries  8. Frank C. Jordan, 1908-1941 

Scope and Content Notes

Frank Craig Jordan was Director from 1930-1941. Jordan worked with Frank Schlesinger at Yerkes and in 1908 followed him to Allegheny Observatory and continued Schlesinger's programs, including parallax methods. Dr. Jordan made outstanding contributions in the endeavor of photographic photometry of variable stars. He died in a house fire in 1941.

  Folder
Ai-A 614
  Folder
Ar-As 615
  Folder
Au-B 616
  Folder
Ca-Co 617
  Folder
Cr-Cu 618
  Folder
Do-Ea 619
  Folder
Eb-Hi 620
  Folder
Ho-K 621
  Folder
L-Me 622
  Folder
Mi-O 623
  Folder
624
  Folder
625
  BoxFolder
Sch 26626-628
  Folder
Sh-Su 629
  Folder
T-Wa 630
  Folder
We-V 631
  Folder
University of Pittsburgh 632

New Material Added, 2013 

  BoxFolder
Jordan - Parkhurst Correspondence, 1908 741

Subseries  9. Nicholas E. Wagman, 1930-1970 

Scope and Content Notes

Nicholas Emory Wagman was Acting Director from 1941-1947, then Director from 1947-1970. Wagman became an astronomer at the Observatory in 1930 and became acting director in 1941 upon Dr. Jordan's death. In 1946 he announced one of the rarest finds of modern astronomy: a dark star in the constellation Ophiucus, which he named "Alpha Opiuchi C." As a result of this discovery, he was appointed Director in 1947. He investigated stellar and astrometric binaries and undertook a comprehensive program of modernization. He played a leading role in the disseminating of information on astronomy to the Pittsburgh public community. He served as lecturer at Buhl Planetarium and conducted forums at the YMCA. He was prominent as a member of the American Astronomical Society and the American Association for the Advancement of Science. He left the Allegheny Observatory in 1970.

  Folder
Ab-Ad 633
  Folder
All 634-635
  Folder
All-Alp 636
  Folder
Ama 637-640
  Folder
American, A-American, M 641
  Folder
An-Ar 642
  Folder
As 643
  Folder
Av-Bea 644
  Folder
Ber-Bil 645
  Folder
Bin 646
  Folder
Bl-Bra 647
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Bro 648
  Folder
Bru-Buh 649
  Folder
By-Cal 650
  BoxFolder
Cam-Clu 27651
  Folder
Clu 652
  Folder
Coh-Com 653
  Folder
Coo-Cu 654
  Folder
Dan 655
  Folder
Dav 656
  Folder
De-Do 657
  Folder
Dr-Ea 658
  Folder
Eb 659-660
  Folder
Ed-Eu 661
  Folder
Fe-Fl 662
  Folder
Fo-Gan 663
  Folder
Ga 664
  Folder
Ge-Go 665
  Folder
Gre-Gri 666
  Folder
Ha-Heb 667
  Folder
Hei-Her 668
  Folder
Hey-Ho 669
  Folder
Hu-Hy 670
  Folder
I-J 671
  Folder
Ka 672
  Folder
Ke-Kl 673
  Folder
Ko-Ku 674
  Folder
La-Le 675
  BoxFolder
Li-Lu 28676
  Folder
Ma-McD 677
  Folder
Mc-Mrc 678
  Folder
Mid-Mu 679
  Folder
Mu 680
  Folder
Mas-Natl 681
  Folder
Nati 682-684
  Folder
Natu-Ne 685
  Folder
No 686
  Folder
Pa-Pe 687
  Folder
Pec-Pi 688
  Folder
Po-Pre 689
  Folder
Pri-Ra 690
  Folder
Re-Ri 691
  Folder
Ro 692
  Folder
Sa-Scho 693
  Folder
Schl-Schw 694
  Folder
Schw-Shar 695
  Folder
Shaw-Shi 696
  Folder
Sho-Sk 697
  Folder
Sm-So 698
  Folder
Sp-Ste 699
  Folder
Stu 700
  BoxFolder
Str 29701
  Folder
Stu-Swa 702
  Folder
Swe-Ta 703
  Folder
Te-U 704
  Folder
Vae-Van, B 705
  Folder
Van, D 706-708
  Folder
Van, P-Vas 709
  Folder
Ve-Wa 710
  Folder
Wee-Westi 711
  Folder
Westo 712
  Folder
Wh-Will 713
  Folder
Wils 714
  Folder
Win-Wu 715
  Folder
Wy-Yo 716
  Folder
University of Pittsburgh, B-Ch 717
  Folder
University of Pittsburgh, Cr 718-721
  Folder
University of Pittsburgh, H 722
  Folder
University of Pittsburgh, L 723
  Folder
University of Pittsburgh, O-P 724
  Folder
University of Pittsburgh, V 725

New Material Added, 2013 

  BoxFolder
Wagman Correspondence, 742-5
  Folder
Wagman Correspondence - Other and University, 6

Subseries  10. Joost H. Kiewiet de Jonge, 1953-1977 

  BoxFolder
Kiewiet de Jonge Correspondence, 747-13
  Folder
Kiewiet de Jonge Correspondence - University Correspondence 14-15

Return to Table of Contents »


Series  II. Letterpress Books of Directors/Acting Directors, 1862-1910 

Scope and Content Notes

As with the correspondence of the Directors/Acting Directors, the letterpress books of the Directors/Acting Directors have also been microfilmed and a detailed item listing can be found in Indexes to the Microfilmed Correspondence of Directors/Acting Directors and selected Astronomers Among the Records of the Allegheny Observatory. There are four books, however, that are not indexed in that inventory. The first, a letterpress book of F.L.O. Wadsworth, has not been microfilmed or indexed. This book is in Box 33. The remaining three in Box 34 are from Frank Schlesinger and were microfilmed separately as AIS.1981.06. Indexes appear at the end of each volume and indexes to all three Schlesinger letterpress books can be found at the beginning of reel 1 of AIS.1981.06 (Microfilm-cabinet 2, Drawer 9).

Subseries  1. Samuel Pierpont Langley, 1884-1889 

Scope and Content Notes

Samuel Pierpont Langley was the first Director of the Allegheny Observatory and held that position from 1867 to 1887. His primary interest was the sun and he began his studies of the sun immediately after assuming the post of Director. Langley prepared drawings of sun spots and associated phenomena and astronomers, today, are still familiar with Langley's classic drawing of the great sunspot of 1873.

In 1869 Langley devised and made operational the electric system of transmitting telegraphic time to several of the Pennsylvania Railroad lines which were associated with the observatory. In the area of magnetic disturbances, Langley was the first to associate such disturbances on the earth with solar outbreaks of an extremely active character.

Concerning studies in the realm of solar physics, Professor Langley was impressed with the idea that much radiant energy from the sun could not be recognized with instruments then in use, and after much experimentation, he invented the bolometer. With this instrument he succeeded in measuring the amount of heat radiation on the earth from the sun (the solar constant).

Professor Langley studied many minor though important questions concerning radiant energy. His investigations of the moon's temperature added greatly to our knowledge of the moon. Langley used his spectrobolometer to measure the highest temperature of the moon which was found to be approximately zero degrees centigrade and the lowest temperature of the moon which was found to be equivalent to the temperature of space.

Langley also collected data on the part of the solar system beyond the infra-red zone. With the aid of Professors Keeler, Very, and Page measurements were made by Langley utilizing the spectrobolometer and the galvanometer which he invented before photographic methods were develop.

Langley, of course, has received much recognition for his contributions to aeronautics. However, his original intention was not to construct a flying-machine, but instead to "determine the laws governing flight." At the Allegheny Observatory, Langley built a whirling arm on which "he tested airfoils, fusiforms and other aerodynamic objects, measuring their angels and pressures as they moved through the air at varying speeds." Studies of actual birds and "mechanical birds" ("winged contrivance" made of tin, cork, and rubber) were conducted and findings published in a paper entitled "Experiments in Aerodynamics."

Professor Langley left his post at the Allegheny Observatory in 1887 (leaving F.W. Very, his assistant, in charge) to become Assistant Secretary of the Smithsonian Institution; later, following the death of Professor Baird, he was elected Secretary of the Institution in 1891. Langley continued his research in aerodynamics and from a catapult, on May 6, 1896, launched an unmanned, steam-powered flying machine over the Potomac. It flew more than a half mile and was subsequently recovered. The first manned flight of his gasoline-powered "aerodome" failed in 1903 because of a launching device defect. Glenn Curtiss successfully piloted Langley's restored plane eight years after his death.

Note: Calendar entries covering the period 1884-1889 (Letterpress books no.'s I, II, and III) consist of abstracts of letters selected from four areas of research: 1) magnetic disturbances, 2) solar radiation, 3) mapping of infra-red spectrum, and 4) aerodynamics. There are also selected abstracts relating to both the electric time signal service and miscellaneous correspondence.

Please note that references to pagination indicate number of pages letters occupy in letterpress books and not necessarily number of pages of actual letters.

  BoxVolume
Samuel Langley, 1862-1872 301
  Volume
Samuel Langley, 1884-1887 2

Scope and Contents note

This calendar, comprised of Volumes 2-3, was prepared by David Lieberman, a student in the Graduate School of Library and Information Sciences, University of Pittsburgh, as an independent study project during September - December, 1973.

 1. Reed, J.R. Pittsburgh, PA Comparative bolometer measurement to determine bolometer efficiency, 2p., March 6, 1884 
 2. Brashear, J.A. Allegheny, PA. Has examined Brashear's lens specimens and has enclosed several items including a bolometer carriage in order that Brashear might measure from it to prepare his own, 2p., March 7, 1884 
 3. Grunow, William. West Point, NY. Langley waiting with great interest the result of experiment with a 1/20 mm. single strip bolometer. [Page 2 of letter not legible, Ed.], 2p., March 7, 1884 
 4. Grunow, William. West Point, NY. A firm in Paris wishes to secure bolometers for the purpose, Langley supposes, of constructing others, 1p., March 8, 1884 
 5. Thaw, William. Allegheny, PA. A discussion of the conditions which cause a rise in the surface temperature of the Earth, 1p., March 14, 1884 
 6. Grunow, William. Encloses a draft for $100 for payment of construction of four bolometers, 2p.,  March 18, 1884 
 7. Grunow, William. West Point, NY. Langley needs badly a 1 mm. bolometer made of 1/10 mm. strips, 2p., March 18, 1884 
 8. Hazen, W.B. Washington, DC. Investigations on heat radiated from the earth's surface, 4p., March 18, 1884 
 9. Brashear, J.A. Allegheny, PA. [Page one not legible thus difficult to determine precise nature of correspondence. It appears that Langley has constructed a "Hot Box", Ed.], 6p., March 26, 1884 
 10. Hazen, W.B. Washington, DC. Observation of a "remarkable sunspot" seen on November 16, 1882, 1p., March 26, 1884 
 11. Comu, A. Concerning a new method for distinguishing between helluric and solar absorption, 2p., April 11, 1884 
 12. Fritts, E.E. New York, NY. Requests a sheet of selenium for experimental purposes, 2p., April 20, 1884 
 13. Grunow, William. West Point, NY. Acknowledge receipt of 0.1 mm. strip bolometer which perfoms well, 1p., April 29, 1884 
 14. Rockwell, A.F. Washington, DC. Opinion on the wiring of underground cable, 2p., April 30, 1884 
 15. Powell, J.W. Washington, DC. "Desirability of making a trial up Mt. Whitney", 4p., May 5, 1884 
 16. Snyder, W.B. Philadelphia, PA. Forwarding bolometer to the International Electrical Exhibition at the Franklin Institute, 1p., May 19, 1884 
 17. Brashear, J.A. Allegheny, PA. Langley proposes to use, in place of a concave mirror of silver copper, a flat mirror silvered on the front face in order to read the reflected scale of his galvanometer, 2p., May 21, 1884 
 18. Thaw, William. Allegheny, PA. Annual report [1883/84] to the Committee of the Allegheny Observatory, 7p., May 27, 1884 
 19. Grunow, William. West Point, NY. Encloses sketches of a new method of constructing a platinum bolometer, 2p., June 2, 1884 
 20. Lowny, R. Washington, DC. The abolition of the U.S. Coast and Geodetic Survey as a separate service would be a "misfortune", 1p., June 16, 1884 
 21. Grunow, William. West Point, NY. French people requesting one linear and one square bolometer, 1p., June 22, 1884 
 22. Thaw, William. Allegheny, PA. Speculated transfer of Allegheny Observatory Trust to a Massachusetts institution, 2p.,  June 24, 1884 
 23. Peal, S.E. Naharani, India. Theoretical measurement of lunar temperature, 2p., June 30, 1884 
 24. Mills, N. Washington, DC. Receives proof copy of pages 215 to 219 of Mt. Whitney Report, 1p., September 17, 1884 
 25. Brashear, J.A. Allegheny, PA. Langley requests preparation of a glass cover mirror to be used in a new spectroscope, 1p., September 27, 1884 
 26. Thomson, William. Glasgow, Scotland. Allegheny Observatory has obtained conclusive evidence as to the character of the ultra-red bands. Suspects that they are probably telluric, 2p., October 6, 1884 
 27. Brashear, J.A. Allegheny, PA. Request to assemble a "Hot Box", 1p., October 31, 1884 
 28. Mills, N. Washington, DC. Recommends a subject index for the mt. Whitney Report, 2p., November 3, 1884 
 29. Franklin, S.R. Washington, DC. Langley welcomes change to midnight as the commencement of the astronomical day, 1p., December 20, 1884 
 30. Grunow, William. West Point, NY. Spectro-bolometer arrived too late for "special occasion it was remodeled for", 1p., January 7, 1885 
 31. Grunow, William. West Point, NY. Request for two cubical vessels made of brass, 1p., February 7, 1885 
 32. Grunow, William. West Point, NY. Requests that an estimate of cost of siderostat be sent, 1p., February 18, 1885 
 33. Tyndall, John. London, England. Observatory will be conducting research on the absorption of radiant heat by water vapor, 1p., February 18, 1885 
 34. Brashear, J.A. Allegheny, PA. Brashear appointed to make all bolometer cases of one uniform use. Sketch of proposed changes in bolometer case enclosed, 1p., February 25, 1885 
 35. Holden, E.S. Determination of the amount of light transmitted by Professor Holden's wave gauge screens, 2p., ca. February 
 36. Grunow, William. West Point, NY. Bolometers examined are up to standard. Approximate resistances are stated, 2p., March 14, 1885 
 37. Hazen, W.B. Washington, DC. A discussion of most efficient method for studying the "selective absorption of solar radiant heat" Also sketch enclosed of proposed physics-meteorological laboratory, 7 p., March 14, 1885 
 38. Mills, N. Washington, DC. Reply to "certain meteorological researches alluded to by the New York Herald", 1p., March 16, 1885 
 39. Goff, M.B. Pittsburgh, PA. A brief statement of the nature of the work of the observatory addressed to the chancellor of Western University of Pennsylvania, 7p., March 18, 1885 
 40. Peal, S.E. Naharani, India. Concerning the direct measurement of lunar heat, 1p., June 12, 1885 
 41. Baird, F.S. Washington, DC. Inquiry as to whether Smithsonian Institute would assist in foreign distribution of Mt. Whitney Report prepared by Allegheny Observatory, 1p., June 26, 1885 
 42. Tatlock, John. Beloit, Wisconsin. States that the Allegheny Observatory was the first to establish an electric time service to railways, 2p., July 3, 1885 
 43. Bramwell, Frederick. London, England. Acknowledgement of receipt of communication of May 14, 1885 extending thanks to members of Royal Institution for expression of their satisfaction with discourse delivered in April 1885, 1p., July 7, 1885 
 44. Blanford, Henry F. Langley inquiring about the temperature of surfaces of "rock or soil, uncovered by snow, at very great altitudes", 2p., July 14, 1885 
 45. Whymper, Edward. London, England. Has forwarded a copy of observations on Mt. Whitney in the Sierra Nevadas which discusses primarily theoretical temperatures of airless planets, 2p., July 14, 1885 
 46. Julius, W.H. Utrecht, Holland. Concerning the determination of wavelengths of heat emitted from bodies below incandescence, 3p., August 14, 1885 
 47. Goff, M.B. Pittsburgh, PA. Making inquiry through Western Union Telegraph Co. concerning a meteor sighting, 1p., October 5, 1885 
 48. Science Magazine. Reports of a meteor in Western Pennsylvania on September 26, 1885 unfounded, 2p., October 7, 1885 
 49. Tyndall, John. London, England. Submits by mail a paper on lunar heat, 2p., October 14, 1885 
 50. Brashear, J.A. Allegheny, PA. Langley requests that Brashear observe "siderostat to see whether a needed adjustment can be introduced to make the telescope [Langley;s] parallel to the declination (and free from present shake)" Sketch enclosed, 2p., October 28, 1885 
 51. Goldback, C. Kehl, Germany. States that observatory is using rock-salt for researches on radiant heat, 1p., November 7, 1885 
 52. Grunow, William. West Point, NY. Requests construction of a bolometer to consist of 3 central strips each 1 mm. wide and 10 mm. in length to be made of platinum which was "heavier than usual", 1p., November 7, 1885 
 53. Austin, W.W. Johnstown, PA. Response to letter of inquiry requesting longitude and local time of Johnstown, 1p., November 24, 1885 
 54. Warner and Suazey. Cleveland, Ohio. Wishes to replace governor of siderostat driving clock, 2p., November 25, 1885 
 55. Brashear, J.A. Allegheny, PA. Discusses conversation with W. Thaw. Request for two 18 mm. discs. Also Langley requests Brashear's presence so that he might present him with a sketch and definite order for work to be done on galvanometer, 2p., November 30, 1885 
 56. Barber, D. Professor Langley wishes to purchase an economical storage battery which will be efficient in maintaining a steady dynamo current, 1p., December 1, 1885 
 57. Brashear, J.A. Allegheny, PA. Langley requests that the following work be executed for Allegheny Observatory: 1) construction of small mirrors for galvanometer; 2) adjustment of galvanometer back and head screw; 3) construction of scale lamp; 4) construction of siderostat and siderostat mirror; 5) construction of other mirrors. Memoranda supplying specifications and sketches enclosed, 7p., December 4, 1885 
 58. Brashear, J.A. Allegheny, PA. Request for a larger lens [usage not specified, Ed.] and a modification of previous order for siderostat mirror. Sketch enclosed, 1p., December 5, 1885 
 59. Brashear, J.A. Allegheny, PA. Request for rock-salt lens of about 75 mm, 1p., December 8, 1885 
 60. Achert, E.E. Denver, Colorado. Langley requests a specimen of rock "capable of furnishing a lens of nearly three inches diameter", 1p., December 10, 1885 
 61. Crunow, William. West Point, NY. Langley posts three carbon filaments, 2p., December 19, 1885 
 62. Hill, Clark Co. Boston, MA. Seeking advice concerning the efficiency of a self-starter as applied to a 4 horse otto gas engine, 1p., January 7, 1886 
 63. Marshall, W.H. Pittsburgh, PA. Explanation of "primary colors" A.L.S. 2p., January 7, 1886 
 64. Wiedemann's Annalen. Leipzig, Germany. Submitting by mail a manuscript on unrecognized wavelengths, 2p., January 9, 1886 
 65. Brashear, J.A. Allegheny, PA. Request for shipment of galvanometer and siderostat mirror, 1p., January 14, 1886 
 66. Foote, A.E. Philadelphia, PA. Request for half dozen dragonflies. [Perhaps has some relation to aerodynamic experimentation, Ed.] A.L.S. 1p., January 16, 1886 
 67. Brashear, J.A. Allegheny, PA. Observatory has not yet received galvanometer, 1p., January 18, 1886 
 68. Colby, E.A. Newark, NJ. Carbon filaments used in conjunction with galvanometer, 1p., January 19, 1886 
 69. Grunow, William. West Point, NY. Request for construction of a linear bolometer, 1p., January 19, 1886 
 70. Frost, A.G. Youngstown, Ohio. "Approximate relative positions of the Sun, the Earth and Venus in January 13, 1886 viewed from the North Side of the Plane of the Ecliptic" Sketch enclosed, 1p., ca. January 
 71. Brashear, J.A. Allegheny, PA. States reasons, lose of light and glare, for defects in opaque seals, 1p., February 8, 1886 
 72. Rise and Guager. Request for construction of one copper and one galvanized iron box. Sketches enclosed, 2p., February 8, 1886 
 73. White, Martin. Glasgow, Scotland. Bolometer function and usage, 1p., February 10, 1886 
 74. Faye, A.E. Paris, France. Requests that chief signal officer of the U.S. Army forward a copy of Volume XV of the signal service publication "Research in Solar Hear",1p., February 18, 1886 
 75. Hodgkins, H.L. Washington, DC. Results of computations recently made were correctly deduced from given data, 2p., February 20, 1886 
 76. Brashear, J.A. Allegheny, PA. F.W. Very requesting that Brashear prepare a condensing lens. L. 2p., March 4, 1886 
 77. Rucker, A.W. London. Bolometers not suitable for lecture demonstration, 2p., March 11, 1886 
 78. Ball, John. London, England. Langley posts copy of his paper "On the Amount of the Atmospheric Absorption", 1p., March 12, 1886 
 79. Hazen, W.B. Washington, DC. Wishes to record "the motion of a galvanometer needle by means of photography", 2p., March 16, 1886 
 80. Vincent, H.B. McConnelsville, Ohio. No "systematic distribution of time to places outside of Pittsburgh" by the Allegheny Observatory, 1p., March 16, 1886 
 81. White, Martin. Glasgow, Scotland. Request for a more sensitive reflecting galvanometer, 2p., March 16, 1886 
 82. Grunow, William. West Point, NY. Carbon bolometer "a mechanical success" but does not perform as well as expected, 3p., March 29, 1886 
 83. Ball, John. London, England. Langley discusses temperature variations of the soil of the full moon, 2p., April 19, 1886 
 84. Marson, G. Paris, France. Submitting by mail to Annales de Chimie et de Physique in a few days complete illustrations for an article on "Invisible Spectrum and their wavelengths", 1p., April 19, 1886 
 85. Thomson, William. Glasgow, Scotland. Research just completed on the relation of the index of refraction to wavelength by utilizing a mirror galvanometer, 1p., April 19, 1886 
 86. Western Union Telegraph Co. Pittsburgh, PA. Request for names of firms, corporations, or individuals receiving clock signals over the Western Union wires, 1p., May 8, 1886 
 87. Grunow, William. West Point, NY. New bloomer case received and is "very satisfactory", 1p., May 17, 1886 
 88. Thomson, William. Glasgow, Scotland. Soon to announce research completed in the area of the heat spectrum, 1p., May 18, 1886 
 89. Grunow, William. West Point, NY. Langley returning bolometer No. 4 because its "working badly having very unequal resistance" Requests its immediate return and wishes to know with what thickness of platinum it is filled, 2p., May 19, 1886 
 90. Gibbs, G.W. New Haven, Connecticut. Seeking counsel in area of theoretical optics, 2p., May 25, 1886 
 91. Darwin, G.H. Cambridge, England. Langley states that he is conducting research on wavelengths in the infrared spectrum and most probably will not be able to attend an international conference in England, 2p., May 29, 1886 
 92. Spoere, G.S. Potsdam, Russia. Concerning sources of solar radiant heat, 2p., May 29, 1886 
 93. Landslo, H. Berlin, Germany. An explanation of determination of wavelengths of infrared lines, 2p., May 31, 1886 
 94. Gibbs, G.W. New Haven, CT. Acknowledges thanks for assistance received in solving a problem in theoretical optics, 1p., June 7, 1886 
 95. Hodgkins, H.L. Washington, DC. Request for assistance in computing solution to a problem in optical physics, 2p., June 7, 1886 
 96. Marson, G. Paris, France. Submitting by mail to the editor of Annales de Chimie et de Physique the completed manuscript of the research referred to in the Comptes Rendus of January 18, 1886, 2p., June 9, 1886 
 97. Aitken, John. Edinburgh, Scotland. Langley requesting literature on the subject of nocturnal radiation, 1p., June 11, 1886 
 98. Grunow, William. West Point, NY. Refilled bolometer No. 14 which arrived in "good order" Several bolometers in need of repair are forwarded along with a new alloy which is said "to possess superior qualities for a bolometer." Lastly, Grunow is cited in European journals as the manufacturer of the Langley bolometer, 2p., June 11, 1886 
 99. Kedzee, J.H. Chicago, Illinois. A critique of a book written by Kedzee on solar radiation, 1p., June 12, 1886 
 100. Goff, Milton B. Pittsburgh, PA. A list of assistants at the Allegheny Observatory, 1p., June 18, 1886 
 101. Hodgkins, H.L. Washington, DC. Request for assistance in computing solutions to an equation. [The nature of which is unspecified, Ed.], 1p., June 23, 1886 
 102. Hodgkins, H.L. Washington, DC. Computations received and "appear to be satisfactory", 1p., July 24, 1886 
 103. Ashburne, Charles A. Philadelphia, PA. Letter with map indicating position of observatory relative to neighboring streets, 1p., July 26, 1886 
 104. Pickering, E.G. Cambridge, MA. "Measurement of the transmission of the Pritchard Wedge," i.e., measuring transmission of solar radiation via bolometer usage, 18p., July 
 105. Grunow, William. West Point, NY. Bolometer No. 13 "measured fairly near equal but neither time would the needle stay in any fixed position but went off the scale", 1p., October 5, 1886 
 106. Nature Magazine. Supplies Nature with an explanation of the corona of a recent eclipse, 2p., October 16, 1886 
 107. Grunow, William. West Point, NY. Langley requests construction of a new bolometer case with an improved eyepiece, 1p., November 1, 1886 
 108. Johnson, J. Pittsburgh, PA. An explanation of how and when time signals are furnished to local railroads. November 4, 1886 
 109. Grunow, William. West Point, NY. Ducretet's bolometer performing well, 1p., November 6, 1886 
 110. Hall and Sons. Buffalo, NY. Instructions for modifying construction of a crucible to be used in determining the radiation of "an entirely fixed temperature which will be given out by a piece of platinum placed at the closed end of a tub", 2p., November 16, 1886 
 111. Konig, Arthur. Berlin, Germany. A discussion of bolometer usage, 2p., November 17, 1886 
 112. Grunow, William. West Point, NY. Bolometer No. 13 "turns out to be all right". "Langley makes some slight modifications for the future construction of the bolometer thread," and inquires as to whether European orders for bolometers have increased, November 18, 1886 
 113. Reed, J.R. Pittsburgh, PA. Comments on Reed's mathematical theory of the bolometer, 2p., November 23, 1886 
 114. Grunow, William. West Point, NY. States main points of improvement for a new spectrometer for the bolometer, 2p., November 29, 1886 
 115. Hall and Sons. Buffalo, NY. Hoping to secure crucibles and furnace while visiting Washington, DC, 1p., December 2, 1886 
 116. Brown, S.C. Washington, DC. Langley extends thanks to Chief Clerk of the U.S. Dept. of State for mediation in receipt of Rumford Award by the Royal Society, 1p., December 3, 1886 
 117. Hall Sons. Buffalo, NY. Request for a "movable plug which can be sled up a lateral radiation tube", 1p., December 4, 1886 
 118. Hall and Sons. Buffalo, NY. "Please forward any work as finished", 1p., December 14, 1886 
 119. Rucker, A.W. London, England. Due to its sensitivity, Langley does not recommend public demonstration of bolometer, 2p., December 14, 1886 
 120. Rucker, Arthur W. London, England. Forwarding bolometers to the Royal Institution, 2p., December 14, 1886 
 121. Pickering, E.G. Cambridge, MA. Use of 5th hour meridian in determination of Pittsburgh local time, 2p., December 15, 1886 
 122. Thomson, William. Glasgow, Scotland. Has succeeded in getting "wonderful results" from Thomson's galvanometer, 1p., December 19, 1886 
 123. Hall and Sons. Buffalo, NY. Deviation from original drawing in manufacture of crucibles received, 2p., December 29, 1886 
 124. Brown, James. Allegheny, PA. Concerning irregular receipt of time signals by the City of Allegheny, PA, 1p., January 8, 1887 
 125. Ledzee, J.H. Chicago, IL. Allegheny Observatory has not "analyzed the heat radiation of any star or planet", 1p., January 10, 1887 
 126. White, James. Glasgow, Scotland. Request for a nonastatic needle, to measure feeble current. Full specifications of instrument supplied, 3p., January 12, 1887 
 127. Brashear, J.A. Allegheny, PA. Langley requests construction of a "short striding level" utilizing a transit bulb. Sketch enclosed, 1p., January 14, 1887 
 128. Grunow, William. West Point. NY. Gold and silver alloy bolometer not working well and is returned, 1p., January 20, 1887 
 129. Anthony, W.A. Ithaca, NY. Langley specifies that his bolometer is not "well adapted for lecture experimentation" and proceeds to provide dimensions for ordering a demonstration model only, 1p., January 24, 1887 
 130. Grunow, William. West Point, NY. Sketches and detailed explanation of design of a "strong independent mounting for the collimator arm", 10p., January 25, 1887 
 131. Grunow, William. West Point, NY. Submitting modifications to be made in construction of colliminator arm, 2p., January 27, 1887 
 132. Tinlow, G.W. Warwick, NJ. Acknowledgement of request for all names of publications dealing with the theory of the bolometer, L., 1p., February 5, 1887 
 133. Brill and Co. Philadelphia, PA. An order of wood of which car seats were made [possibly related to aerodynamic experimentation. E.], 1p., February 7, 1887 
 134. Lamansky, S. St. Petersburgh, Russia. Will forward results of investigations on the infra-red spectrum,1p., February 14, 1887 
 135. Grunow, William. West Point, NY. Langley wishes to refill bolometer No. 13, L. 1p., February 23, 1887 
 136. Gray, Thomas. Glasgow, Scotland. Awaiting with interest the announcement of the performance of a new nonastatic galvanometer, 1p., March 5, 1887 
 137. Hall Sons. Buffalo, NY. Not able to report on performance of crucibles which lack "plugs as their specifications demanded", 1p., March 5, 1887 
 138. Grunow, William. West Point, NY. Request for status of bolometers nineteen and thirteen, 1p., March 7, 1887 
 139. Johnston and Co. Pittsburgh, PA. Request for a heavier rubber elastic band than the one enclosed. [rubber related to flight experimentation, Ed.], 1p., March 7, 1887 
 140. Warner and Swazey. Cleveland, OH. An examination of the siderostat driving clock of the Allegheny Observatory, L., 2p., March 7, 1887 
 141. Peal, S.E. Naharani, India. Speculation of lunar temperature, a response to paper submitted to Langley by Peal, 2p., March 8, 1887 
 142. Powell, J.W. Washington, DC. Request for an opinion concerning Peal's lunar heat hypothesis, 2p., March 8, 1887 
 143. Fleuriais. Paris, France. Langley desirous to obtain a "mechanician familiar with the construction of gyroscopes", 2p., March 9, 1887 
 144. Glaiser, James. Blackheath, England. Request for data concerning mechanical flight, 1p., March 9, 1887 
 145. Johnston and Co. Pittsburgh, PA. Rubber band received buy lacking in both strength and weight. [Related to flight experimentation, Ed.], 1p., March 9, 1887 
 146. Rayleigh. Presently conducting experiments on the resistance of air of bodies in motion. Tequest for recommendations concerning any line of investigation likely to be of special interest, 1p., March 9, 1887 
 147. Thurston. Langley requests information on: first, the names of modern authorities "on air in motion at various inclinations to it"; second, the title of a modern work on wind mills; third, information of the Cunard streamers. Fourth, the name of a "really intelligent and trustworthy model-maker", 2p., March 9, 1887 
 148. U.S. Army, Chief Signal officer. Washington, DC. Request for information pertaining to resistance of plane surfaces to air in motion, 1p., March 9, 1887 
 149. Grunow, William. West Point, NY. Langley wishes to order a new bolometer to be numbered 20, L., 1p., March 19, 1887 
 150. White, James. Glasgow, Scotland. Modifications to be made in construction of a galvanometer. Sketch enclosed, L.,1p., March 19, 1887 
 151. Phillips and Co. Request for elastic rubber [probably to be used in aerodynamic experimentation, El.], 1p., March 26, 1887 
 152. Phillips and Co. Pittsburgh, PA. Submitting order for elastic rubber to be used in aerodynamic experimentation, 1p., March 28, 1887 
 153. Brashear, J.G. Allegheny, PA. Working drawings for Whirling Table nearly completed, 1p., March 30, 1887 
 154. Tennant, George B. Pittsburgh, PA. Modification in specification of Whirling Table, 1p., March 30, 1887 
 155. Specification of the Whirling Machine, A.D.S., 2p., ca. March 
 156. Christern, F.W. New York, NY. Request for information pertaining to cost of the publication, L'Aeronaute, 1p., April 12, 1887 
 157. Christern, F.W. New York, NY. Request for price of publication Histoire des Ballons by Gaston Fissandier, L., 1p., April 21, 1887 
 158. Brashear, J.A. Allegheny, PA. Sketch of [Whirling Table?], 1p., April 25, 1887 
 159. Brashear, J.A. Allegheny, PA. Experiments indicate that double wheel model [aircraft] should be discontinued and replaced by Renaud aircraft. Sketch of Renaud aeroplane enclosed, 3p., April 26, 1887 
 160. Queen and Co. Philadelphia, PA. Wishes to obtain a tachometer or tachograph. [Probably related to aerodynamic experimentation, Ed.], 1p., April 26, 1887 
 161. Phillips and Co. Pittsburgh, PA. Please state cost, width, and length of roll of elastic rubber to execute order for rubber 1/8 and also 1/4 inch thickness, 1p., April 27, 1887 
 162. U.S. Army, Chief Signal Officer. Washington, DC. Concerning the absolute temperature of the earth's surface and the measurement of solar radiation, 3p., April 27, 1887 
 163. Concerning the "true color of the sun", A.D.S., 2p., ca. April 
 164. Fire Department. Allegheny, PA. Complaints concerning inaccurate time signals to be directed to the Allegheny Observatory, L., 1p., May 7, 1887 
 165. Tennant, George B. Philadelphia, PA. Check enclosed in payment for services rendered in preparation of drawings and estimates for a Whirling Table, 1p., May 18, 1887 
 166. U.S. Treasury Dept., Bureau of Statistics. Washington, DC. A list of Langley's scientific papers published by the U.S. Government, L., 1p., May 18, 1887 
 167. Brashear, J.A. Allegheny, PA. Sketch of aeroplane [barely legible, Ed.], 2p., May 20, 1887 
 168. Christern, F.W. New York, NY. Second request for ordering publication L'Aeronaute, 1p., May 25, 1887 
 169. Thaw, William. Pittsburgh, PA. Annual Report 1886/87 of the Director, 6p., ca. May 
 170. Rowe, Charles O. Titusville, PA. Response to inquiry concerning time service, 1p., June 2, 1887 
 171. Rowe, Charles O. Titusville, PA. A "description of the devices for striking time signals" L. 2p., June 3, 1887 
 172. Ballot, Buys. Ultrecht, Holland. Expresses interest on status of research in the area of lunar heat, 1p., June 13, 1887 
 173. Clerke, Agnes M. London, England. Concerning studies on absorption of the earth's atmosphere, 3p., June 13, 1887 
 174. Warner and Swasey. Cleveland, Ohio. Request for a siderostat driving clock be repaired as soon as possible, L., 1p., June 14, 1887 
 175. Stoletow, A. Moscow, Russia. Concerning radiation analysis by means of heat spectrum and aid of bolometer, 2p., June 17, 1887 
 176. Queen and Co. Philadelphia, PA. Second request for ordering information pertaining to tachometer and tachograph, 1p., June 18, 1887 
 177. Hazen, Allen. Washington, DC. Erecting a Whirling Table of "exceptional size" to carry out experiments in anemometry and the resistance of air to bodies in motion including railroad trains. Expects to make experiments in fall with a locomotive and platform cars, 2p., June 25, 1887 
 178. Woodwell and Co. Pittsburgh, PA. Wishes to obtain a tachometer and dynamometer, 2p., June 25, 1887 
 179. Brashear, J.A. Allegheny, PA. Concerning the mounting of two large reflecting mirrors at the Allegheny Observatory, 3p., June 29, 1887 
 180. District Telegraph Co. Pittsburgh, PA. Wire from which railroads are receiving time signals running into several jewelry stores, 2p., June 29, 1887 
 181. Metzgar, Henry. Pittsburgh, PA. Serious complaints from railroads for not receiving time signals, 1p., July 2, 1887 
 182. Abbe, Cleveland. Washington, DC. Request for a chronograph cylinder to be used for aerodynamic experimentation, 2p., July 5, 1887 
 183. Rotch, A. Lawrence. Request for data on the varying velocity of the wind during short intervals of time, e.g., every quarter of minute or less. Further that Rotch request attach a chronograph to an anemometer which would record electronically the varying velocities on a uniformly revolving board, 2p., July 5, 1887 
 184. Rowe, Charles O. Titusville, PA. Request for a pole to be set up close to the Observatory with wires leading to the top of chromograph [Probably be used in measurement of wind velocity, Ed.], 1p., July 5, 1887 
 185. Grunow, William. West Point, NY. Request fro sketch of collimator and prism table, 3p., July 8, 1887 
 186. White, James. Glasgow, Scotland. Inquiry as to when galvanometer will be completed. No acknowledgement of letter of March 19, 1887, 1p., July 8, 1887 
 187. Queen and Co. Philadelphia, PA. Purchasing tachometer no. 4 running from 25 to 3000 revolutions per minute, 1p., July 12, 1887 
 188. Rotch, A. Lawrence. Acknowledgement of receipt of chronographic record. Requests that record should in the future be obtained on a time scale, ten times as long, "so that the changes from minute to minute can be recognized during an hour or so", 1p., July 13, 1887 
 189. Rowe, Charles O. Titusville, PA. Acknowledgement of receipt of pole used in connection with chromograph, 1p., July 14, 1887 
 190. Description of "self recording apparatus to be placed at end of arm of great Whirling Table", 8p., July 15, 1887 
 191. Glassford, W.O. Prescott, Arizona. Corcerning the variations of solar radiation from hour to hour, L., 3p., August 3, 1887 
 192. Ohio Meteorological Bureau. Youngstown, OH. Diagram of the positions of Venus, Earth, and Sun on August 14, 1887, L., 1p., August 19, 1887 
 193. Langley, J.A. Washington, DC. Status of research at Allegheny Observatory. Whirling Table not yet erected, L., 5p., September 10, 1887 
 194. Reid, H.F. Cleveland, OH. Concerning strongest current a bolometer will bear, L., 1p., September 15, 1887 
 195. Reid, H.F. Cleveland, OH. Specifications of bolometer, no. 1, L., 1p., September 28, 1887 
 196. Grunow, William. West Point, NY. Wishes to test collimator and prism table, 1p., November 8, 1887 
 197. De Motte, John B. Greencastle, IN. Brief description of bolometer manufacture and usage, L., 1p., November 9, 1887 
 198. Peal, S.E. Naharain, Sigsagar, India. Lunar research nearly completed. Findings to be issued by U.S. Government Printing Office, 1p., November 9, 1887 
 199. Barus. Determination of the relation between emission and temperature by spectrobolometric methods, 1p., November 23, 1887 
 200. Hall and Sons. Buffalo, NY. Request for a dozen crucibles. Sketch enclosed, 1p., November 23, 1887 
  Volume
Samuel Langley and Frank Very, 1887-1888 3
 1. Smyth, Thomas H. Toronto, Canada. A bolometer might be devised to measure the temperature of a liquid, 2p., January 26, 1888 
 2. Thaw, William. Pittsburgh, PA. Requests permission to allow J.A. Brashear to use thirteen-inch equatorial to conduct his own research, T.L.S., 2p., January 27, 1888 
 3. De Motte, John B. Greencastle, IN. Forwarding information concerning bolometer theory and place and name of manufacturer of bolometer, 2p., January 31, 1888 
 4. De Motte, John B. Greencastle, IN. Sending two pamphlets containing illustrations and full descriptions of the bolometer and its theory, 2p., January 31, 1888 
 5. Reid, H.F. Cleveland, OH. Acknowledge of receipt of description of experiments with the bolometer by Professor H.F. Reid of the Case School of Applied Science, January 31, 1888 
 6. Brashear, J.A. Allegheny, PA. Brashear directed to prepare a scale for the "White" galvanometer. Also a request for 4 galvanometer mirrors of 1 meter values of curvature, 1p., February 2, 1888 
 7. Brashear, J.A. Allegheny, PA. Langley authorizes Brashear to use 13 inch equatorial of Allegheny Observatory for his own researches, 2p., February 2, 1888 
 8. White, James. Glasgow, Scotland. Generally pleased with finish and solardarity of galvanometer. However, hinges to enable magnets to be unclasped from glass rod were disregarded, 1p., February 2, 1888 
 9. Brashear, J.A. Pittsburgh, PA. Preparation of a box of seasoned pine to hold the new "White" galvanometer, L., 3p., February 3, 1888 
 10. Grunow, William. West Point, NY. Final modifications of dynometer - chronograph made by Brashear in Pittsburgh, T.L.S., 2p., February 16, 1888 
 11. Langely, S.p., Washington, DC. Very conducting experiments with humming birds, L., 2p., February 25, 1888 
 12. Brashear, J.A. Allegheny, PA. "Langley wishes to have made for the Smithsonian Institute a rocking case with plate glass top, mirror at sides and bottom and spring stands to hold twenty humming birds" Sketch enclosed, L., 2p., February 29, 1888 
 13. Abney, W. de. Wivelislile London, England. Concerning atmospheric absorption of acceptance of post at Smithsonian Institute, 6p., February 
 14. Sheaffer, C.W. Pittsburgh, PA. "Scarcely any current in the telegraph line", L., 1p., March 1, 1888 
 15. Mead, Elwood. Ft. Collins, CO. Provides ordering information for actinometer and spectrobolometer. Supplies instructions for use of instruments in place of aforementioned ones, 2p., March 5, 1888 
 16. Rood. Wishes to obtain data concerning the "brightness of the normal eye to the pure spectrum colors", 1p., March 14, 1888 
 17. Batchalde, A. Pelham, NH. Concerning the relationship between lightning and the fall of meteoric dust, L., 1p., March 21, 1888 
 18. Witchell. "Taking measures of the intensity of different colored lights taking for instance red, yellow, blue, or any number of other spectral colors from the same sources and same prism, and trying the comparative intensities of each by noting the relative illuminating powers by suitable tests for the normal eye", 1p., March 30, 1888 
 19. Pennsylvania Railroad. Altoona, PA. Posting a copy of a printed circular describing time signal distributions, L., 1p., April 5, 1888 
 20. McIntire, Johnston. Allegheny, PA. Langley wishes a box to be constructed to house stuffed humming birds. Sketch enclosed, L., 2p., April 28, 1888 
 21. Brashear, J.A. Allegheny, PA. Wishes to have a 20 inch mirror of one meter focus silvered, 1p., May 11, 1888 
 22. Grunow, William. West Point, NY. Concerning construction of a spectrobolometer which must be completed within ten months, 2p., May 11, 1888 
 23. Hale. No French engines for utilizing solar heat more recent than those of Mouchot, exhibited in 1878. French commission report engine not feasible to operate. J. Ericson's engine not economically feasible to operate, 1p., May 11, 1888 
 24. McIntire, Johnston. Allegheny, PA. Modifications in construction of box to contain stuffed humming birds, L., 1p., May 11, 1888 
 25. Reuben, Levi. New York, NY. Acknowledgement of receipt of the book, Travels in the Air. Langley states also with regard to inequalities in the distribution of clouds and rain that he cannot render a judgment on such a meteorological question, 1p., May 15, 1888 
 26. Thomson, W. Philadelphia, PA. Request for the title of the best treatise on color vision, L., 1p., May 24, 1888 
 27. Thaw, William. Pittsburgh, PA. Statement of cash receipts and expenditures of the Allegheny Observatory also includes annual report 1887/88 on the "scientific labors of the Observatory" [one page not legible, Ed.], T.L.S., 6 p., ca. May 
 28. Grunow, William. West Point, NY. No response concerning construction of spectrobolometer. Langley soon to depart for Europe, 1p., June 23, 1888 
 29. Crova, A. Montpelliar, Vermont. Concerning a new value of the solar constant. Description of galvanometer usage and sketch of galvanometer enclosed, 3p., June 25, 1888 
 30. Notes on the History of the Doctrine of Radiant Energy, A.D. S., 10p., ca. June 
 31. Grunow, William. West Point, NY. Dynomemterchronograph found to be a very satisfactory instrument but a few modifications necessary, T.L.S., 1p., July 12, 1888 
 32. Ticknor and Co. Boston, MA. Possibility of publishing a cheap edition of the New Astronomy in the U.S. and a costly edition in England, 1p., August 13, 1888 
 33. Peal, S.E. Naharani, Sibsagar, India. Commentary on the nature of the moon's rays, L., 2p., August 15, 1888 
 34. American Journal of Science. New Haven, CT. Enclosed copy of article entitled "Energy and Vision" for November publication, 1p., September 28, 1888 
 35. American Journal of Science. New Haven, CT. Concerning the return of the proof copy of an article entitled "Energy and Vision", 1p., October 23, 1888 
 36. London, Edinburgh, and Dublin Philosophical Magazine. Forwarding proof of an article on "Energy and Vision", which was expected to appear in the American Journal of Science for November, 1888, 1p., October 23, 1888 
 37. Gibbs, Wilcott. Newport, RI. Langley prepared to make a personal examination of disposition of Bache fund for purposes specified on researches in solar physics; description of research in progress, 2p., November 5, 1888 
 38. Brashear, J.A. Allegheny, PA. Langley providing Brashear with assistance in determining the "dispersive power" of a crown lens, 2p., November 9, 1888 
 39. Accounts payable for October and November, 1888, L., 1p., Allegheny, PA, November 22, 1888 
 40. American Journal of Science. New Haven, CT. Request for 500 copies in paper covers of History of a Doctrine, 1p., December 3, 1888 
 41. Ballot, Buys. Ultrecht, Holland. Will post in a few days an abstract of the paper, "On the Solar and Lunar Spectrum," published in the December 1888 issue of the Journal of Science, 2p., December 3, 1888 
 42. Turner, S.E. Pittsburgh, PA. Wishes to have the "shaft of the turn table made frictionless", 2p., December 3, 1888 
  Volume
Samuel Langley, Frank Very, and James Keeler, 1889-1891 4
 1. [Memorandum] Authorization for removal of pieces of apparatus, which were the personal property of Mr. W. Thaw, to the personal charge of Langley. Signed by W. Thaw, A.D.S., 2p., June 19, 1889 
 2. Annual Report [1888/89] of the Director of the Allegheny Observatory, A.D.S., 4p., ca. June 
  BoxVolume
James Keeler, 1887-1894 311
  Volume
Frank Very and James Keeler, 1892-1895 2
  Volume
James Keeler, John Brashear, F.L.O. Wadsworth, and Henry Harrer, 1895-1901 3
  BoxVolume
John Brashear, 1898-1900 321
  Volume
F.L.O. Wadsworth, 1901-1902 2
  Volume
F.L.O. Wadsworth, Frank Schlesinger, and Frank Bailey, 1902-1906 3
  BoxVolume
F.L.O. Wadsworth, 1896-1902 331
  BoxVolume
Frank Schlesinger, 1907-1910 341-3

Return to Table of Contents »


Series  III. Directors/Acting Directors Miscellany, 1863-1978 

Scope and Content Notes

Series III contains publications, correspondence, articles, notes, manuscripts and other miscellaneous materials arranged by Director.

Subseries  1. Samuel Langley 

Publications 

  BoxFolder
Articles by Langley 351
  Folder
Bound Volumes of Langley Works 2
  Folder
Samuel Pierpont Langley - His Early Academic Years of Western University of Pennsylvania, by Wallace Beardsley 1978 3
  Folder
Rules and Regulations, by the London Chathan and Dover Railway Company, 1863 4
  BoxFolder
Bound volume of Langley publications, most dealing with the Mt. Whitney expedition 35a5
  BoxFolder
Resolution passed by the Board of Regents of the Smithsonian Institution on Langley's death, 1906 366

Correspondence 

  Folder
Correspondence of Langley relatives, 1908-1909, 1911, 1942, 7
  Folder
Handwritten Instructions in user of "waste book", September 15, 1890 8

Notes and Manuscripts 

  Folder
Notes on Newton's Optics 9
  Folder
Untitled 10

Subseries  2. Frank Very 

  Folder
Articles by Very 11
  Folder
Articles about Very 12
  Folder
Notes and Manuscripts 13

Subseries  3. James Keeler 

  Folder
Articles by Keeler 14

Subseries  4. John Brashear 

  Folder
Articles by Brashear 18
  Folder
Articles about Brasheas 19
  Folder
Catalogs of John A. Brashear, Co., Ltd. 20
  Folder
Miscellaneous 21

Subseries  5. F.L.O. Wadsworth 

  Folder
Articles by Wadsworth 22
  BoxFolder
Notes and Manuscripts 3723-36
  BoxFolder
Notes and Manuscripts, continued 3837-48
  Folder
Miscellaneous 49
  Folder
Articles about Keeler 15
  Folder
Unknown 16
  Folder
Miscellaneous 17

Subseries  6. Frank Schlesinger 

  Folder
Publications by Schlesinger 50
  Folder
Notes and Manuscripts 51
  Folder
Miscellaneous 52

Subseries  7. Heber Curtis 

  Folder
Articles by Curtis 53
  Folder
Articles about Curtis 54
  Folder
Notes and Manuscripts 55
  BoxFolder
Notebook on Spanish 3956
  Folder
Notebook on Mayan 57
  Folder
Cash Account for Sproul Expedition through July 21, 1923 58

Subseries  8. Frank Jordan 

  Folder
Articles by Jordan 59
  Folder
Articles about Jordan 60
  Folder
Notes and Manuscripts 61-66
  Folder
Journals (2 volumes), 1908-1909 67
  Folder
Miscellaneous 68

Subseries  9. Nicholas Wagman 

  Folder
Articles by Wagman 69
  Folder
Open House at the Observatory, 1951-1965 70

Return to Table of Contents »


Series  IV. Correspondence of Affiliated Astronomers, 1886-1972 

Scope and Content Notes

The following correspondence is available on microfilm and in its original form. For a detailed list of correspondents consult Indexes to the Microfilmed Correspondence of Directors, Acting directors, and Selected Astronomers Among the Records of the Allegheny Observatory.

Subseries  1. Frank Bartko, 1960-1971 

  BoxFolder
A-I 401
  Folder
2
  Folder
K-U 3

New Material Added, 2013 

  BoxFolder
Frank Bartko Correspondence 7416

Subseries  2. Wallace Beardsley, 1958-1970 

  Folder
A-Be 4
  Folder
Bi-Bu 5
  Folder
C-D 6
  Folder
7
  Folder
F-Ga 8
  Folder
Gr-H 9
  Folder
I-L 10
  Folder
M-R 11
  Folder
12
  Folder
T-Z 13
  Folder
Miscellaneous 14
  Folder
University of Pittsburgh 15

New Material Added, 2013 

  BoxFolder
Wallace R. Beardsley Correspondence 7417

Subseries  3. Kievin Burns, 1920-1958 

  Folder
Ab-Ad 16
  Folder
Ai 17
  Folder
Ak 18
  Folder
Akl-Alt 19
  Folder
Alu-American Asso 20
  Folder
American Ast 21
  Folder
American C-As 22
  Folder
Bab-Bal 23
  Folder
Ban-Bar 24
  Folder
Be-Bo 25
  Folder
Bra-Bri 26
  Folder
Brou 27-36
  BoxFolder
Brow-Bu 4137
  Folder
Ca-Ci 38
  Folder
Cl 39
  Folder
Co-Cn 40
  Folder
Da-Di 41
  Folder
Do-Du 42
  Folder
Ea 43-46
  Folder
Eb-El 47
  Folder
Em-Fi 48
  Folder
Fl-Gae 49
  Folder
Gal-Gr 50
  Folder
Hak-Has 51
  Folder
Har 52-55
  Folder
Haw-He 56
  Folder
Hi-Ho 57
  Folder
Hu 58
  Folder
Hy-Ins 59
  Folder
Ins 60-61
  Folder
Int-Jac 62
  Folder
Jam-Ki 63
  Folder
Kie 64-66
  Folder
Kin-La 67
  Folder
Le-McL 68
  Folder
McM 69-70
  BoxFolder
Ma 4271
  Folder
Meg 72-86
  Folder
Mellon 87-89
  Folder
Mellor-Mer 90
  Folder
Mer 91-92
  Folder
Mey-Mi 93
  Folder
Moo 94
  Folder
Mor 95
  Folder
Mu-Pes 96
  Folder
Pen-Pr 97
  Folder
Po-Ru 98
  Folder
Ru 99
  Folder
Saint 100
  BoxFolder
Sa-Sca 43101
  Folder
Schl 102-105
  Folder
Schu-Shu 106
  Folder
She-Sil 107
  Folder
Sit 108-110
  Folder
Sk-Sm 111
  Folder
Sp-St 112
  Folder
Su 113-127
  Folder
Swa 128
  Folder
Swa-Ti 129
  Folder
To-U 130
  BoxFolder
Va-Ve 44131
  Folder
Ve 132
  Folder
Vy-Warg 133
  Folder
Warn-We 134
  Folder
Wi-Wo 135
  Folder
Wr-Wy 136
  Folder
Y-Z 137
  Folder
University of Pittsburgh, B-Cl 138
  Folder
University of Pittsburgh, Co 139-142
  Folder
University of Pittsburgh, F-G 143
  Folder
University of Pittsburgh, L-Pl 144
  Folder
University of Pittsburgh, Pr-Sec 145
  Folder
University of Pittsburgh, Sec 146-149
  Folder
University of Pittsburgh, Si-V 150

Subseries  4. Zaccheus Daniel 

  Folder
A-B 151
  Folder
C-D 152
  Folder
F-H 153
  Folder
154
  Folder
L-P 155
  Folder
R-Sa 156
  Folder
Sc 157
  Folder
Sk-W 158
  Folder
University of Pittsburgh 159

Return to Table of Contents »


Series  V. Affiliated Astronomers Miscellany, no date 

Subseries  1. Kievin Burns 

  BoxFolder
Articles by Burns 451
  Folder
Articles about Burns 2
  Folder
Notes and Manuscripts 3-12

Subseries  2. Zaccheus Daniel 

  Folder
Articles by Daniel 13
  Folder
Articles about Daniel 14
  Folder
Miscellaneous Material Relating to Daniel's Education 15
  Folder
Miscellaneous 16

Subseries  3. J.H. Kiewiet de Jonge 

  Folder
Articles by de Jonge 17
  Folder
Notes and Manuscripts 18-22
  BoxFolder
Miscellaneous 4623

Subseries  4 Wallace Beardsley 

  Folder
Stellar Radial Velletities- a report made with a grant from the U.S. Navy, along with related correspondence and financial information 24

Subseries  5. Robert Kemper 

  Folder
Eclipse Six (June 30, 1954), July 8, 1954 25

Return to Table of Contents »


Series  VI. Administrative Files, 1858-1977 

Subseries  1. University of Pittsburgh (Western University of Pennsylvania prior to 1909) 

  BoxFolder
Catalogs for Astronomical Deptartment, 1883-1889 461
  Folder
Five items to R. B. Carnahan, attorney for the University, from William Thaw, Samuel Langley and James Keeler on dispute over property boundaries of the observatory, 1885 2
  Folder
Five items from N.E. Wagman on the Astronomy Department, 1961 3

New Material Added, 2013 

  BoxFolder
Affirmative Action 7418
  Folder
Astronomy 011 Course Evaluations, Fall 1968 19
  Folder
Astronomy Lab Manual 20
  Folder
Intro to Astronomy Lab Manual 21
  Folder
Astronomy 2 Lab Manual 22
  Folder
Astronomy Lab Guidelines 23
  Folder
Astronomy Lecture - George Gatewood 24
  Folder
Computer Center 25
  Folder
Core Curriculum 26
  Folder
Course Proposal, Fall 1972 27
  Folder
Course Syllabi 28-29
  Folder
Department of Astronomy - Demographics, 1971 30
  Folder
Department of Astronomy - Statement of Mission 31
  Folder
Departmental Data 32
  Folder
Eureka Newsletter 33
  Folder
Exams 34
  Folder
Frick Public Evening Program 35
  Folder
Graduate Student Information 36
  Folder
The Humanist - "Objections to Astrology" 37
  Folder
Keyholder Memo 38
  Folder
Kiewiet de Jonge Planner, 1971 39
  Folder
Proposals 41
  Folder
Seminars 42
  Folder
Staff - Postcards 43
  Folder
Teaching: Graduate Students 44
  File
Textbooks 45
  Folder
Wagman's Annual report notes, July 1962-July 1974 46
  Folder
Wagman - Retirement 47

Subseries  2. Reports and Minutes 

  BoxFolder
Director's Reports, 1873, 1900-1903, 1909, 1916, 1918-1920, 1938, 1940-1941, 1951-1952, 1964-1969 465
  Folder
Report detailing the duties of the Director, c. 1880 6
  Folder
Various Reports 7
Statistics re:visitors, 1909-1956 
List of Faculty, 1914-1915 
Report by F. Schlesinger describing observatory, no date 
Publication for the year ending June 30, 1917 
Report from the committee on stellar paid taxes for the year ending June 30, 1918 
Inventory of Observatory apparatus, no date 
Allegheny Parralae Program, no date 
  Folder
Minutes of Allegheny Observatory and Telescope Association, May 14, 1858, May 15, 1860, November 12, 1863 8
  Folder
Allegheny Observatory, 1882-1912 9
  Folder
Meetings of the University concerning the Observatory, extracts, 1867-1873, August 23, 1943 10

New Material Added, 2013 

  BoxFolder
Annual Fund Giving Report, 1974 7448
  Folder
Annual Reports, 1967-1976 49
  Folder
Faculty Activity Reports, 1972-1988 50
  Folder
PPBS, 1969-1973 51
  Folder
Measuring Reports, 1967-1969 52

Subseries  3. Building Specifications 

  BoxFolder
General contract work specifications 4611
  Folder
Fire proofing 12
  Folder
Plastic work 13
  Folder
Tile and asphalt roofing 14
  Folder
Iron work 15
  Folder
Concrete floors 16
  Folder
Painting and glazing 17
  Folder
Marble work 18
  Folder
Carpenter work 19
  Folder
Metal work 20
  Folder
Typed copy of contract specifications 21
  Folder
Written draft of contract specifications 22
  Folder
Map 23
  Folder
Building dimensions 24
  Folder
Building estimate 25
  Oversize
Design of Observatory Dark Room 26
  Oversize
Plan of Observatory, 1895 27
  Oversize
Plan for an Astro-Physical Observatory, 1892 28

New Material Added, 2013 

  BoxFolder
Astronomical Laboratory, 1972-1973 751a-1b
  Folder
Chancellor Letter on Rennovations, December 10, 1974 2
  Folder
City Police, 1974-1975 3
  Folder
Duquesne Light, 1955 4
  Folder
Locks Installed, July 14, 1970 5
  Folder
Astronomy Slides and Photos 6
  Folder
Exterior Lighting 7
  Folder
Furnishings 8
  Folder
Lecture Hall 9
  Folder
Riverview Park - Lighitng Improvements 10
  Folder
Second Floor Alterations 11
  Folder
Thaw Dome 12
  Folder
Thaw Dome Ice Guards 13
  Folder
Theiss Documents, 1971-1973 14-15
  Folder
Telescopes - 6 inch Brashear Refractor 16
  Folder
Telescopes - Keeler Telescope Proposal 17
  Folder
Telescopes - Keeler Comparison Spark 18
  Folder
Telescopes - Keeler Contracts 19
  Folder
Telescopes - Keeler Correspondence 20
  Folder
Telescopes - Keeler Data/Graphs 21
  Folder
Telescopes - Keeler Drawings 22
  Folder
Telescopes - Keeler Amplifier 23
  Folder
Telescopes - Keeler Dew Warning 24
  Folder
Telescopes - Keeler Mirror 25
  Folder
Telescopes - Keeler Program Report, 1961 26
  Folder
Telescopes - Keeler Observing Procedures 27
  Folder
Telescopes - Keeler Stiffening Rods 28
  Folder
Telescopes - Mellon Spectrograph Heat Management 29
  Folder
Telescopes - Small Astrograph 30
  Folder
Telescopes - Thaw Telescope Contracts, 1971-1974 31-33
  Folder
Telescopes - Thaw Telescope Bids and Reports 34
  Folder
Telescopes - Thaw Telescope Lens Alignment 35
  Folder
Telescopes - Thaw Telescope Owens-Illinois Correspondence, 1973-1975 36
  Folder
Telescopes - Thaw Telescope Proposal 37
  Folder
Telescopes - Hartman Tests 38
  Folder
Telescopes - Hartman Tests 31" Keeler Telescope 39
  Folder
Telescopes - Renovation 40

Subseries  4. Library 

  BoxFolder
Books and periodicals ordered, 1899-1902 4729
  Folder
Books and periodicals ordered, 1903-1919 30
  Folder
Donations, 1903-1923 31
  Folder
List of periodicals holdings, February 6, 1952 32

New Material Added, 2013 

  BoxFolder
Allegheny Observatory Library - LS 258 Project 7541
  Folder
Allegheny Observatory Library Renovations 42
  Folder
Missing Books, August 15, 1974 43

Subseries  5. Allegheny Observatory Committee 

  BoxFolder
Reports to the Chancellor of the University of Pittsburgh, 1871 4833
  Folder
Reports to the Chancellor of the University of Pittsburgh, 1900-1907 34
  Folder
Minutes, 1898-1901 35

Subseries  6. General Office Files 

  Folder
Budgets, 1867-69 36
  Folder
Budgets, 1913-1935 37
  Folder
Budgets, 1937-1943 38
  Folder
Budgets, 1943-1949 39
  Folder
Budgets, 1949-1954 40
  Folder
Budgets, 1954-1957 41
  Folder
Budgets, 1960-1963 42
  Folder
Budgets, 1963-1969 43
  Folder
Miscellaneous receipts, 1873-1909 44
  Folder
Cash books, Samuel Langley, 1870-1872, 1876-1881, 1882-1892, 1891-1899 45
  Folder
Cash books, Frank Very, 1870, 1871-1875, 1875 46
  Folder
Cash books, Frank Very, 1878, 1879-1880, 1880-1881, 1881 47
  Folder
Cash books, Frank Very, 1881, 1882, 1882-1883, 1891 48
  Folder
Check receipt books, 1883-1887 49
  Folder
Check receipt books, 1885-1889 50
  BoxFolder
Check receipt books, 1889-1891 4951
  Folder
Petty Cash books, 1883-1891 52
  Folder
Petty Cash books, 1891-1900 53
  Folder
Account books, 1905-1914 54
  Folder
Account books, 1914-1919 55
  BoxFolder
Account books, 1927-1954 5056
  Folder
Day books, 1870-1879 57
  Folder
Day books, 1895-1900 58
  Folder
Cash account books, 1880-1882 59
  Folder
Cash account books, 1881-1895 60

New Material Added, 2013 

  BoxFolder
Budgets, 1969-1972 7544
  Folder
Budgets, 1972-1973 45
  Folder
Budgets, 1973-1974 46
  Folder
Budgets, 1974-1975 47
  Folder
Budget Summary,  1977 48
  Folder
General Office Equipment Corporation 49
  Folder
Telephone 50
  Folder
Visitors Register, 1892 51
  Folder
Visitors Register, 1911 52

Subseries  7. William Thaw File 

Letters to Thaw 

  BoxFolder
Brashear, John A. (Astronomical and Physical Instrument Works, Allegheny, PA), September 19, 1887, April 7, 1891 5161
Carnahan R. B. (Board of Trustees, Western University of Pennsylvania , February 13, 1885-August 19, 1885 
Goff, M.B. (Chancellor, Western University of Pennsylvania), December 30, 1872 
Gray, D.S. (Union Railroad and Transportation Company, Columbus, Ohio), December 4, 1871 
Griggs, Joseph F. (Western University of Pennsylvania), August 4, 1890 
Holland William J. (Chancellor, Western University of Pennsylvania), April 14, 1891-January 27, 1894 
  Folder
Keeler, James E. (Director, Allegheny Observatory, before 1892 of Lick Observatory, Mount Hamilton, CA), July 31, 1890-March 12, 1891, January 6, 1894 62
Kerr, C.U. (Western University of Pennsylvania), August 11, 1890 
Koons, C.H. (Union Lane, Baltimore), February 28, 1879 
Laying, J.D. (various railroad companies, Pittsburgh), November 29, 1871-May 13, 1873 
  Folder
Scott, James B. (Pittsburgh), July 24, 1890 63
Smith, Edmund (Pennsylvania Rail Road Company, Philadelphia), October 24, 1870 
United States Chief Signal Officer (S.M. Mills), October 4, 1883 
Very, Frank W. (Allegheny Observatory), January 14, 1890-May 2, 1891 

Letters from Thaw 

  Folder
Cassat, A.J. (Pennsylvania Railroad, Philadelphia), May 26, 1870, April 17, 1882 64
Carnahan, R.B. (Board of Trustees, Western University of Pennsylvania), October 9, 1884 
Emerson, R.H., May 7, 1885 
King, Josah and C. Hussey, May 15, 1872 
Layng, J.D. (various railroad companies, Pittsburgh), November 27, 1871-May 31, 1873 
  Folder
Correspondence record, no date 65
  Folder
Personal property at Observatory, no date 66
  Folder
Principal observatory instruments, no date 67

Return to Table of Contents »


Series  VII. Observation, 1869-1930 

Scope and Content Notes

Series VII contains measurements, notebooks, journals, wastebooks, drawings, and yearbooks of observations recorded at the Allegheny Observatory arranged by astronomer.

Subseries  1. Notebooks 

Samuel Langley 

  BoxFolder
Longitude, 2 volumes 521-2
  Folder
Spectroscopy 3
  Folder
Wastebook, 1876-1880 4

F.L.O. Wadsworth 

  BoxFolder
Astronomy and Geodesy 535
  Folder
Chemical Physics 6
  Folder
Chemistry 7
  Folder
Civil Engineering 8
  Folder
Daily Journal 9
  BoxFolder
Elliptic Functions, Theory of 5410
  Folder
Field Book 11
  Folder
Functions, Theories of 12
  Folder
Hydraulics 13
  Folder
Laboratory Notebook 14
  BoxFolder
Lunar Host 5515
  Folder
Mathematics 16
  Folder
Mechanism 17
  Folder
Miscellaneous 18
  Folder
National Academy of Arts and Sciences, Proceedings of Observations 19
  Folder
Physics 20-21
  Folder
Physics Laboratory 22-23
  Folder
Prisms, Measuremnet of 24
  Folder
Science and Engineering, Reference List of Papers 25
  Folder
Specific Light 26
  Folder
Theoretical Optics 27
  BoxFolder
Thermometer, Calibration of 5628
  Folder
Untitled Notebook, no date 29
  Folder
Unititled Notebook, 1901 30

Frank Schlesinger and Frank Jordan 

  Folder
Unititled Notebook, 1909-1913 31

Frank Jordan 

  Folder
Orbit of 18 aquile 32
  BoxFolder
Orbit of lyrae 5733
  Folder
Orbit of orrons 34
  BoxFolder
Orbit of serpentis 5835
  Folder
Radical Velocity of 25 stars 36
  BoxFolder
Records, 1884-1930 5937
  Folder
Spectrographic observations of parsel 38

Robert Baker 

  BoxFolder
Observations, 1907-1908 6039
  Folder
Observations, 1908-1909 40

William Scaife 

  BoxFolder
 1873 6141

Level Notebooks 

  Folder
 December 1868-August 1872 42
  Folder
 August 1872-May 1878 43
  Folder
 June 1878-August 1884 44
  Folder
 August 1884-August 1892 45

Observatory Notebooks 

  Folder
C.L. Parker July 1870-January 1872 46-47
  Folder
Samuel S. Strassner and A.E. Frost, January 1872-December 1872 48
  Folder
A.E. Frost, January 1873-January 1874 49
  Folder
A.E. Frost, March 1874-December 1875 50-51
  Folder
A.E. Frost and R.F. Hall, July 1876-January 1877 52

Wastebooks 

  Folder
James Keeler, 1881-1882 53
  Folder
Alfred B. Selir, 1883 54
  Folder
James Page 1887-1888 55-56

Yearbooks 

  BoxFolder
 1869-1884 6257-72
  BoxFolder
 1885-1891 6373-79
  BoxFolder
 1892-1900 6480-88

Miscellaneous 

  BoxFolder
Address Books 6589-91
  Folder
Character of the Defractory at the Focus of a Telescope 92
  Folder
Constants 93
  Folder
Heat Book 94
  Folder
Least Squares 95
  Folder
Miscellany 96
  Folder
Optical Notes 97
  Folder
Photography 98
  Folder
Photometric Observations 99
  Folder
Time by Single Altitudes of the Sun 100
  Folder
Unititled 101-105
  BoxFolder
Unititled 66106-107

Subseries  2. Drawings 

Sunspots 

  BoxFolder
 February 1873-December 1876 67108
  BoxFolder
 January 1877-December 1880, 1882 68109
  BoxFolder
A Typical Sunspot December 23-24, 1873 69110
  Oversize
Untitled Drawing by Langley, 1873 111
  Oversize
Original Pencil Drawing, March 5-7, 1873 112
  Folder
Original Pencil Drawing, December 24, 1873 113

Mars 

  Folder
Drawings of Mars and of Schiaparalli Globe showing Opposition of 1892, by James Keeler 114
  Oversize
Outline Drawing of Mars, by Keeler, August 17-September 17, 1892 115

Jupiter 

  Folder
Circle Cut to Scale with the Dimensions of Jupiter Written, no date 116
  Oversize
Copy of Professor Keeler's Drawings of September 17, 1891, by Frank Schlesinger, no date 117

Saturn 

  Folder
Circle Cut Outs to Scale of Saturn and her Rings with Dimensions Written, no date 118

Return to Table of Contents »


Series  VIII. Graphic Materials, 1878-1910 

Subseries  1. Mechanical Drawings 

Samuel Langley 

  Oversize
Design for an Integrating A[?] Nets, 1886 1
Sketch of Whirling Table for Flying Tests, from Langley Letterbook #3 
Sifting Train, Solar Lunar Spectrum, Figure 1 
Illustrating Principal of Transformation of Information from the Prismatic to the Normal Spectrum 
The Infra-Red Solar Spectrum of a 60 Rock-Salt Prism 

F.W. Very 

State of the Sky 1878-1879 
Curve d=f(2) for the Hastings Rock Salt Prism 
Curves Showing the Effect of Atmospheric Absorption on the Distribution of Energy in the Spectrum of the Higher Prism 

J.E. Keeler 

Sketch of a Design for a Star Spectroscope for the 36-inch Equatorial of the Lick Observatory 

John A. Brashear 

Alt-Arimuth Mounting for 6 1/2" Comet Seeker, 1887 

F.L.O. Wadsworth 

Various Designs for Telescopes 

Frank Schlesinger 

Various Designs for Telescopes; Maps of the Gulf Coast Comet of 1907 and Halley's Comet of 1910, Ursa Major, and Mt. Whitney 

New Material Added, 2013 

  BoxFolder
13" Telescope Diagrams 7553
  Folder
Console 54

Fonds Drawings 

Folder
55
  Folder
Electrical 56
  Folder
Telescope 57
  Folder
Thaw Console 58
  Folder
Thaw Shutter 59

Subseries  2. Notes and Research (New Material Added, 2013) 

  BoxFolder
"Barnard's Star" - Peter Van de Kamp, 1975 761
  Folder
Cards - Catalogues 2
  Folder
Celestial Mechanics 3
  Folder
Colloquium Notes, 1969-1970 4
  Folder
Consultation - Notes 5
  Folder
Dante 6
  Folder
Spectroscopic Orbit 7
  Folder
Drafts and Scraps 8
  Folder
Error Theory 9
  Folder
Material taken from file called "First Drafts" 10
  Folder
Focal Curve of Thaw Telescope 11

Fonds Graphs on Curvature 

Folder
12
  Folder
IGY Satellite 13
  Folder
Kapteyn-Van Rhijn equation 14
  Folder
Keeler Telescope - Thermal Response 15
  Folder
Mellon Spectrograph - Focal Plane 16
  Folder
Mellon Spectrograph - Line Curvature 17
  Folder
Membrane Problem 18
  Folder
Navigation 19
  Folder
Material from file entitled "Old Measuring Engine" 20
  Folder
Optics 21
  Folder
Plate Information and Records, 1900-1934 22
  Folder
Reductions - Spectrograph 23
  Folder
Sensitometer, 1962 24
  Folder
Small Brashear Measuring Engine - notes and measurements 25
  Folder
Sunspot Numbers, 1953-1975 26

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Series  IX. Publicity, 1893-1902 

  BoxFolder
News Releases, 1893-1902 701

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Series  X. News Clippings (Miscellaneous), 1907-1947 

  Folder
 1907-1947 2

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Series  XI. Scrapbooks, 1873-1917 

  Oversize
Contains Newsclippings on Langley, 1873-1898 1
  Oversize
Commonplace Book, 1895-1917 2

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Series  XII. Organizations and Societies, 1899-1960 

Subseries  1. Astronomical Society of Pittsburgh 

  Folder
Constitution 3
  Folder
Checkbook 4

Subseries  2. American Astronomical Society 

  Folder
Minutes of the Council (President's Copy), 1899-1917 5
  Folder
Minutes, 1936-1939 6
  Folder
Programs of Meetings, 1912, 1937-1941 7
  Folder
Meeting at Pittsburgh, April 18-21, 1960 8
  Folder
Correspondence, 1956-1960 9-11
  Folder
Lectures, Radio Astronomy 12
  Folder
Lectures, Sub-Dwarf Stars 13
  Folder
Financial Information 14

Subseries  3. National Science Foundation 2013 

Scope and Content Notes

New Material Added, 2013

  BoxFolder
NSF Proposal, December, 1954 7628

Kiewiet de Jonge, Joost H. "Application for a Grant for Scientific Research in Astronomy". December, 1954

  Folder
NSF Proposal, January, 1955 29

Wagman, N.E. "Application for a Grant to Provide Quipment for the Observation and Study of Spectroscopic Binaries at the Allegheny Observatory". January, 1955

  Folder
NSF Proposal, November, 1956 30

Wagman, N.E. "Application for a Grant to Provide Equipment for the Observation and Study of Spectroscopic Binaries at the Allegheny Observatory". November, 1956.

  Folder
NSF Final Reports on Grants G-2372 and G-3948, 1956 31
  Folder
NSF Proposals, 1961,1965,1966,1968 32

Kieweiet de Jonge, Joost H. "Application for a Grant to Provide Equipment and to Support Additional Personel Needed in the Study of Spectroscopic Binaries at the Allegheny Observatory". August,1961.

Wagman, N.E. "Application for a Grant to Support the Observation and Study of Spectroscopic and Astrometric Binaries at Allegheny Observatory". November, 1965.

Wagman, N.E. "Application for a Grant to Support a Continuation of the Program of Observation and Study of Spectroscopic and Astrometric Binaries at the Allegheny Observatory". December, 1966.

Wagman, N.E. "Application for a Grant to Support a Continuation of the Program of Observation and Study of Spectroscopic and Astrometric Binaries at the Allegheny Observatory". March, 1968.

  Folder
NSF Proposals, 1968 - 1971 33

Wagman, N.E. "Application for a Grant to Support a Continuation of the Program of Observation and Study of Spectroscopic and Astrometric Binaries at the Allegheny Observatory". March, 1968.

Wagman, N.E. "Application for a Grant to Support a Continuation of the Program of Observation and Study of Spectroscopic and Astrometric Binaries at the Allegheny Observatory". April, 1970.

  Folder
NSF Proposal, March 12,1973 34

Kiewiet de Jonge, Joost H. "A Proposal to Help Support a New Effort to Significantly Improve Existing and Future Allgeheny Parallaxes, Sept. 1, 1973 - Aug. 31, 1974". March 12, 1973.

  Folder
NSF Final Reports, 197-1969 35

Subseries  4. Extrasolar Planetary Foundation 

Scope and Content Notes

New Material Added, 2013. First meeting in 1980, the Extrasolar Planetary Foundation was led by George Gatewood, director of the Allegheny Observatory. As a non-profit organizaton, it's goal was to "promote, foster, sponsor and support astronomical research in the detection and study of extrasolar plnatery systems." Today it remains focused on these same goals.

  Folder
Extrasolar Planetary Foundation - Goals, By Laws, Minutes, Agendas 36
  Folder
Extrasolar Planetary Foundation - Correspondence 37
  Folder
Extrasolar Planetary Foundation - Press Releases, Publicity 38
  Folder
Extrasolar Planetary Foundation - Memos 39
  Folder
Extrasolar Planetary Foundation - Finances 40

Subseries  5. Other Organizations 

  BoxFolder
National Research Council Questionaire 7627
  Folder
IAU BE Star Cooperation, 1961-1962 41
  Folder
Amatuer Astronomers Association of Pittsburgh 42
  Folder
U.S. Naval Observatory - Allegheny Observatory Use Agreement 43
  Folder
U.S. Naval Observatory - Observatory Questionaire 44
  Folder
Pittsburgh Bicentennial Commision 45
  Folder
Baldwin-Whitehall School District 46

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Series  XIII. Publications, 1870-1975 

Subseries  1. Monographs 

  BoxFolder
Oxford University Examination Responses, James Parker and Co.: London, Trinity Term, 1870 711
  Folder
Annals of the Astronomical Observatory of Harvard College, vol.3, John Wilson Son; Cambridge, MA, 1876 2

New Material Added, 2013 

  Folder
"Researches on Solar Heat and Its Absorption by the Earth's Atmoshphere" 47

Langley, Samuel Pierpoint. Researches on Solar Heat and its Absoprtion by the Earth's Atmosphere. A Report of the Mount Whitney Expedition. Government Printing Press; Washington. 1884.

Subseries  2. Pamphlets 

  BoxFolder
Computing, Pamphlets and Catalogs on Computing Machines, 1906-1939 723-7
  Folder
Optical Equipment, Pamphlets and Catalogs, 1910-1939 8-13

New Material Added, 2013 

  Folder
American Design Components 3-72 Guidebook 48
  Folder
Astro-Mechanics Inc. 49
  Folder
Boller-Chivens 50-51
  Folder
Calculators 52
  Folder
Comparators 53
  Folder
Dark Room catalogues 54
  Folder
David W. Mann Company 55-56
  Folder
Digitzer 57
  Folder
Grant Instruments 58
  Folder
Grant - Legal 59
  Folder
Grant Machine - Manual 60
  Folder
Hewlett-Packard 2114A Computer Manual 61
  BoxFolder
Hollow Cathode Tubes 771
  Folder
Instrumentation at Astronomical Observatory 2
  Folder
Keeler - Telescope 3
  Folder
Magnetic Counters 4
  Folder
Measuring Equipment 5
  Folder
Measuring Systems 6
  Folder
Optical Equipment Brochures 7
  Folder
Optical Instruments/Accessories 8
  Folder
PDP Computers 9-11
  Folder
Photomultiplier Tubes 12
  Folder
Projection Measuring Lens correspondence 13
  Folder
Remote Job Entry 14
  Folder
Shaded Pole Motors Blower Wheels 15
  Folder
Sorbus 16
  Folder
Spectrograph 17
  Folder
Spitz Planetarium 18
  Folder
Telescopes 19-21
  Folder
Westing House Documents 22

Subseries  3. Reprints and Scholarly Papers 

  Folder
Allegheny Reprints 23

Wagman, N.E. "A Large Lens Gets a Face Lifting." 1945.

Wagman, N.E. "Update." in from The Astronomical Journal 67, No. 9, November 1962.

Wagman, N.E. "Update." in The Astronomical Journal 68, No. 9, November 1963.

Wagman, N.E. "Update." in The Astronomical Journal 70, No. 9, November 1965.

Beardsley, W.R. et al. "Photographic determinations of the parallaxes of 25 stars with the Thaw refractor." Repinted from the Astronomical Journal, Vol. 78, No. 1. February 1973.

Beardsley, W. R. "Astrometric-Spectroscopic Techniques of Double Stars with Particular Application To γ Geminorum." Reprinted from IAU Symposium No. 30, 1967. Birkenhead: Willmer Brothers Limited, 1967.

Bartko, Frank and R. A. Hanel. "Non-Gray Equilibrium Temperature Distributions Above the Clouds of Venus." Reprinted from The Astrophysical Journal, Vol. 151, January 1968.

Beardsley, Wallace R. "Astrometric-Spectroscopic Triple System Mizar B." Reprinted from The Astronomical Journal 69, No. 8, October 1964.

Vaerewyck, Eugene G. and W.R. Beardsley. "Motion of Fourteen Stars in the Orion Nebula Cluster." Reprinted from The Astrophysical Journal, No. 182, May 15 1973.

Gatewood, George. "An astrometric study of Lalande 21185." Reprinted from The Astronomical Journal, Vol. 79, No. 1, January 1974.

Gatewood, George and Alan L. Behall. "On the nature of the triple-star system 13 Ceti." Reprinted from The Astronomical Journal, Vol. 80, No. 12, December 1975.

Gatewood, George and Jan Paul Dabrowski, "On the Trigonometric Parallaxes of Several Subdwarf Stars." Gatewood, George. "An Astrometric Study of Kuiper 84 (BD + 4°3562)."

Kamper, Karl W. Jr. "Parallax and orbit for the suspected subluminous binary 2 Andromedae." Reprinted from The Astronomical Journal, Vol. 79, No. 1, January 1974.

Kiewiet de Jonge, Joost H. "On the Relationships Between the Frequency Functions of Stellar Velocities." Reprinted from The Proceedings of the National Academy of Sciences, Vol. 34, No.12, December 1948.

Kiewiet de Jonge, Joost H. "Three-star Position Tables for Air Navigation." Reprinted from The Journal of the Institute of Navigation, Vol.5, No.1, January 1952.

Kiewiet de Jonge, Joost H. "Testing A 100-inch Mirror." Written for American Optical, Date Unknown. Kiewiet de Jonge, Joost H. "Notes on the Interpretation of Astigmatic Coefficients as Derived from a Hartmann Test Analysis." Written for Owens-Illinois, January 28, 1969.

Schlesinger, Frank. "A Simple Method for Adjusting the Polar Axis of an Equatorial Telescope." in Miscellaneous Scientific Papers of the Allegheny Observatory, Vol. 2, No. 1. Reprinted from Popular Astronomy, Northfield Minnesota, 1911.

Lippincott, Sarah Lee and Nicholas E. Wagman. "Parallax and Orbital Motion of the Astrometric Binary α Ophiuchi from Plates Taken with the Allegheny 30 in. Thaw Refractor and the Sproul 24-in. Refractor." Reprinted from The Astronomical Journal, Vol. 71, No. 2, March 1966.

  Folder
"Accuracy of Radial Velocities Determined with Fiber Optic Electrostatic Image Tube" 24

Beardsley, W.R. et al. "Accuracy of Radial Velocities Determined with Fiber Optic Electrostatic Image Tube." Reprinted from Publications of the Allegheny Observatory of the University of Pittsburgh, Vol. 7, No. 7, 1969.

  Folder
"Copernicus" 25
  Folder
"Recording of Star Spectra with a Fiber Optic Electrostatic Image Intensifier" 26

Hansen, J.R., Joost H. Kiewiet de Jonge and W.R. Beardsley. "Recording of Star Spectra with a Fiber Optic Electrostatic image Intensifier." Reprinted from Image Technology, August/September, 1969.

  Folder
"The Astrometric Standard Region in Praesepe (M44)" 27

Russell, Jane Lorene. "The Astrometric Standard Region in Praesepe (M44)." Submitted to the Graduate Faculty of Arts and Sciences in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy, University of Pittsburgh, 1976.

  Folder
"Corrections to Observed Frequency Distributions" 28

Bok, Bart J. and Joost H. Kiewiet de Jonge. "Corrections to Observed Frequency Distributions." Cambridge, Massachusetts, December 10, 1949.

  Folder
"The Effect of a Flattened Earth on the Motion of Artificial Satellites in Near Earth Orbit" 29

Stein, John W. "The Effect of a Flattened Earth on the Motion of Artificial Satellites in Near Earth Orbit." December 7, 1972.

  Folder
"An interative technique for the rectification of observed distributions" 30

Lucy, L. B. "An iterative technique for the rectification of observed distributions." Reprinted from The Astronomical Journal, Vol. 79, No. 6, June 1974.

  Folder
"Magnetic Reversals of the Earth As Affected by its Gyrodynamical Stability" 31

Allen, James B. "Magnetic Reversals of the Earth as Affected by its Gyrodynamical Stability." September 12, 1974.

  Folder
"On the Absolute Magnitudes of the A-Type Stars" 32

Kiewiet de Jonge, Joost H. "On the Absolute Magnitudes of the A-Type Stars." A Thesis Submitted in Partial Fulfillment of the Requirement for the Degree of Doctor of Philosophy, Cambridge, Mass: Harvard University, May 1, 1954.

  Folder
"On the Steady Flow of Gas From the nuclei of Seyfert Galaxies" 33

Wolfe, Arthur M. "On the Steady Flow of Gas From the Nuclei of Seyfert Galaxies." Reprinted from The Astrophysical Journal, Vol. 188, No. 2, March 1, 1974.

  Folder
"Present and Future Effects of Mercury Vapor Lighting on Astronomical Research" 34

Breakiron, Lee and Jane Russell. "Present and Future Effects of Mercury Vapor Lightning on Astronomical Research." for Astronomy 232, October 1971.

  Folder
"A Proposal to Form An Astrometric Instrument Definition Team for the Large Space Telescope" 35

Beardsley, Wallace R. "A Proposal to Form an Astrometric Instrument Definition Team for the Large Space Telescope." February 23,1973.

  Folder
"A Proposal to Survey Nearby Stars for the Perturbative Effects of Extrasolar Planetary Systems, January 1, 1976 - December 31, 1976." 36

Gatewood, George D. "A Proposal to Survey Nearby Stars for the Perturbative Effects of Extrasolar Planetary Systems, January 1, 1976 - December 31,1976." July 9, 1975.

  Folder
"Recent Research on the Third Integral of Motion" 37

Zajdel, T.T. Jr. "Recent Research on the Third Integral of Motion." for Celestian Mechanics, Astronomy 218. April 6, 1971.

  Folder
"A Summary of the Work of Percival Lowell" 38

James, Hayes. "A Summary of the Work of Percival Lowell." Astronomy 218.

  Folder
"Tidal Interactions and Spin-Orbit Coupling" 39

Breakiron, Lee "Tidal Interactions and Spin-Orbit Coupling." for Celestial Mechanics, April 12, 1971.

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Series  XIV. Correspondence (Miscellaneous), 1881-1900 

Scope and Content Notes

Series XIV contains miscellaneous correspondence from the individuals at Allegheny Observatory. The (?) denotes that the author or receipiant is illegible or unknown.

  BoxFolder
To Prof. George Davidson, ? From J.J. Stewart Wells, Fargo Co's Express, Lone Pine, CA. Discusses Davidson's planned trip up Mt. Whitney in California July 6, 1881 731
To ?. From B.S. Hillard, Monroeville, AL. Discusses train arrivals in Monroeville and the cost of lodging, ais, May 4, 1890 
To ?. From ?, Clark University, Worchester, MA. Requests information on insulated wires for an article on which he is working, ALS, August 1891 
To Penn Sharpe Manufacturing Co., ?. From?, Clark University, Worcester, MA. Requests an order for a worm, AL, October 16, 1891 
To Harry Harrer, esquire, Allegheny Observatory. From?, Harvard College Observatory, Cambridge, MA. Informs him of his unsuccessful search for a comet about which Harrer had mentioned to him previously, ALS, September 5, 1896 
To Frank Thompson, first vice-president, Pennsylvania Railroad, Philadelphia, from Benjamin Thaw, Pittsburgh. Letter gives historical background on Samuel Langley's work on standardized time, Photocopy, April 30, 1896 
To Henry Harrer, Allegheny Observatory, from Hamilton Holt, editor of The Independent, New York. Request manuscript of an article by Harrer, TLS, March 24, 1900 
To Ms. Munscher, ? from E.A. Strong, ? Discusses longitude of Grand Rapids, ALS, no date 

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Series  XV. History, 1912-1987 

Scope and Content Notes

Series XV contains histories of the Allegheny Observatory. All of the known authors are listed. If the author is not listed, he/she is unknown.

  Folder
The Allegheny Observatory of the University of Pittsburgh, [c. mid 1950s] by Theordora M. Lauterbach 1
  Folder
The Allegheny Observatory, [c. mid 1910s] 2
  Folder
Data Relating to the History, Organization, and Activities of the Allegheny Observatory of the University of Pittsburgh, [c. 1930-37] 3
  Folder
Allegheny Observatory, 1958 by Lee Sellars. Also, includes a letter to Sellers from Director Wagman suggesting small changes in his manuscript. 4
  Folder
Allegheny Observatory of the University of Pittsburgh: Data presented for consideration if the Commission on Justifications of Higher Education, Middle States Association of Colleges and Secondary Schools, 1952 5
  Folder
Pittsburgh's Eye on the Universe, Allegheny Observatory, from  Equitable News, May-June, 1975 6
  Folder
Astronomy in Pittsburgh, from  The Presbyterian Banner, September 5, 1912 7
  Folder
Copy of Act of Incorporation 8
  Folder
Copy of Deed to Observatory Land 9
  Folder
Speech on Observatory given by Dr. Holland, no date 10
  Folder
Notes on Observatory History 11
  Folder
Dedication of the New Observatory Building, 1912 12
  Folder
Program from the dedication of the new observatory 13
  Folder
Speech given by Chancellor McCormick at the dedication of the new observatory building 14
  Folder
Speech given by, ?, President of the Astronomical and Astrophysical Society of America at the dedication of the New Observatory Building 15
  Folder
Invitation list for dedication 16
  Folder
Invitation for dedication 17
  Folder
Subscription solicitation for dedication 18
  Folder
Romancing the Stars, by David A. Fryxell,  Pitt Magazine, July 1987 19
The Allegheny Observatory of the University of Pittsburgh, pamphlet, 1985 
The Wandering Stars of Allegheny, by Roger Sinnot,  Sky Telescope, October, 1987 

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Series  XVI. Photographs, 1886-1922 

Scope and Content Notes

Series XVI contains photographic prints and negatives (mainly glass plates) of the Observatory, along with personal photography of some of the astronomers. The prints, found in Boxes 16-17, are mostly of the negatives that are part of the collection. Some of these photographs have been scanned and are available online.

Subseries  1. Photographic Negatives 

Original Allegheny Observatory 

Exterior Views 

  BoxFolder
Original Allegheny Observatory 11
  Folder
Original Allegheny Observatory building (George W. Tea, photographer: 1886) 2
  Folder
Old Allegheny Observatory, front view (George W. Tea, photographer: 1886) 3-4
  Folder
Original Allegheny Observatory 5-9

Interior Views 

  Folder
Seat ladder from Fitz telescope 10
  Folder
13 inch refractor, Allegheny Observatory 11
  Folder
13 inch refractor (Fitz) 12
  Folder
16 inch Wolf doublet mounted on 13 inch Allegheny Observatory Equatorial (R.R.M. Thorne, photographer) 13

Observations and Research 

  Folder
Sunspot drawing, S.P. Langley 14-15
  Folder
List of the principal memoirs and articles on scientific research conducted at the Allegheny Observatory, 1869-1893 16

Second Allegheny Observatory 

Exterior Views 

  Folder
Keeler's proposed plan for the Allegheny Observatory (1895) 17
  Folder
Proposed designs for new Allegheny Observatory 18-19
  Folder
Allegheny Observatory construction site preparation (R.R. M. Thorn, photographer: June 23, 1900) 20
  Folder
Allegheny Observatory construction, foundation work (R.R.M. Thorne, photographer: July 17, 1900) 21-22
  BoxFolder
Allegheny Observatory construction (R.R.M. Thorne, photographer: July 17, 1900) 1a1
  Folder
Allegheny Observatory construction (R.R.M. Thorne, photographer, July 28, 1900) 2
  Folder
Allegheny Observatory construction, view of wall erection (R.R.M. Thorne, photographer: July 28, 1900) 3
  Folder
Allegheny Observatory construction, wall erection (R.R.M. Thorne, photographer: August 25, 1900) 4
  Folder
Allegheny Observatory construction, stone laying (R.R.M. Thorne, photographer: October 20, 1900) 5
  Folder
Allegheny Observatory construction 6-18
  BoxFolder
Allegheny Observatory construction 21-3
  Folder
View of Allegheny Observatory before completion of domes 4
  Folder
Allegheny Observatory construction front elevation 5
  Folder
Allegheny Observatory construction, general view of scaffolding 6
  Folder
Allegheny Observatory construction, scaffolding 7
  Folder
Allegheny Observatory 8
  Folder
Allegheny Observatory, front view 9
  Folder
Allegheny Observatory, showing transit house, (lantern slide) 10
  Folder
Front view of Allegheny Observatory 11
  Folder
Front view of Allegheny Observatory, (Frank Jordan, photographer; positive image). 12
  Folder
Southeast view of Observatory, (Positive image) 13
  Folder
Observatory grounds 14
  Folder
Observatory grounds, looking west 15-16
  Folder
Path to Observatory by Keeler dome, (March 3, 1924) 17
  Folder
From roof of Allegheny Observatory, looking west 18
  Folder
Group on roof of Allegheny Observatory 19

Interior Views 

  BoxFolder
Hallway, Allegheny Observatory 31
  Folder
Lecture hall, Allegheny Observatory 2
  Folder
Director's Office, Allegheny Observatory 3-4
  Folder
Library, Allegheny Observatory 5
  Folder
Urania window 6
  Folder
Statue of John A. Brashear 7
  Folder
Allegheny Observatory shop 8
  Folder
Allegheny Observatory shop, from south 9
  Folder
Allegheny Observatory shop, showing part of large planer 10
  Folder
Sector case and mount on dome power console 11
  Folder
Worn-out 8" dome guide wheels 12

Equipment 

  Folder
Porter Spectrograph 13-14
  Folder
Head of Porter Spectrograph, (November 14, 1913) 15
  Folder
Slit of Porter Spectrograph 16
  Folder
Small Spectrograph and accessories 17
  Folder
Infrared Spectrograph 18
  Folder
Spectrograph 19
  Folder
Spectrograph diagram (interferometer grating) 20
  Folder
Interferometer grating spectrograph 21
  BoxFolder
Interferometer measuring attachment, (January 1929) 41
  Folder
Blink comparator, from left 2
  Folder
Blink comparator, from right 3
  Folder
Burns' comparator 4
  Folder
Zeiss comparator of the Allegheny Observatory 5
  Folder
Riefler clock 6
  Folder
Ordinary arc 7
  Folder
Vacuum arc 8
  Folder
Vacuum arc, bell off 9
  Folder
Hilger siderostat 10
  Folder
Galv. Refractometer, Chas. A. Francis, U. of C. 11
  Folder
"G" refractometer, Chas. A. Francis, U. of C. 12
  Folder
Parallax measuring machine, (April 1, 1914) 13
  Folder
Measuring engine 14
  Folder
Measuring engine, from left, (April 1, 1914) 15
  Folder
Long screw measuring engine 16
  Folder
Gear and vernier scales of Burns' measuring engine 17
  Folder
Large measuring engine, (October 13, 1926) 18
  Folder
Comparison measuring engine 19
  Folder
Brashear measuring engine 20
  BoxFolder
Brashear measuring engine 51
  Folder
Brashear plate holder 2
  Folder
Brashear device 3
  Folder
Instrument: John A. Brashear Co., Ltd. 4
  Folder
Instrument: John A. Brashear 5
  Folder
Instrument 6-9

Thaw Telescope 

  Folder
Thaw lens on grinding table at Brashear's shop, (May 8, 1914) 10
  Folder
30" disc on grinding table, (May 8, 1914) 11
  Folder
Glass discs and scrap after cutting 12
  Folder
30" disc (flint), (May 8, 1914) 13
  Folder
30" discs with cases before grinding 14
  Folder
Thaw lens finished; Dr. Schlesinger and Mr. McDowell (August 3, 1914) 15
  Folder
Thaw mounting construction (castings for pier made in the Rosedale Foundry machined by the Wilson Snyder Co.) 16
  Folder
Thaw mounting construction; head in position 17
  Folder
Thaw mounting 18
  Folder
Thaw lens ready to be installed in tube 19
  Folder
Thaw Telescope objective end, (July 7, 1915) 20
  Folder
Thaw Telescope, (July 7, 1915) 21
  BoxFolder
Thaw Telescope 61
  Folder
Thaw plate holder and eyepiece arrangement 2
  Folder
3" camera on Thaw tube 3
  Folder
Dr. F. C. Jordan at Thaw Telescope 4
  Folder
Thaw plaque 5
  Folder
Thaw Telescope 6-7

Other Telescopes 

  Folder
Transit telescope, Allegheny Observatory 8
  Folder
Zenith telescope 9

Observations 

  Folder
Moon (January 9, 1915) 10
  Folder
Moon (January 25, 1915) 11
  Folder
Moon (January 28, 1915) 12
  Folder
Moon 13-15
  Folder
Pleiades (December 7, 1918) 16

People Associated with the Allegheny Observatory 

Individuals 

  Folder
Samuel P. Langley: from Scientific American, Issue of August 29, 1887 17
  Folder
Dr. Curtis (May 31, 1914) 18
  Folder
Dr. Meggers 19
  BoxFolder
   Mr. Daniel at the telescope. (November 14, 1920) 6a1
  Folder
F.C. Jordan at the telescope (November 14, 1920) 2
  Folder
F.C. Jordan at the telescope 3
  Folder
F.C. Jordan at 40" telescope 4
  Folder
Dr. Kievin Burns 5-7

Groups 

  Folder
Group on Allegheny Observatory steps, showing Shapeley on left 8
  BoxFolder
Steps of Allegheny Observatory: Plaskett, Eichelberger, Jordan, Schlesinger, Pickering, Brashear, Thaw, Daniels 71
  Folder
Astronomical Society, group photo. 2

John A. Brashear 

Portraits 

  Folder
John A. Brashear 3
  Folder
John A. Brashear (Copy: May 4, 1920) 4
  Folder
John A. Brashear 5

Work 

  Folder
Brashear Co. Shop (May 8, 1914) 6
  Folder
Brashear's optical shop 7
  Folder
6" equatorial for Mt. Pleasant School by Brashear 8

Personal Photography of Frank C. Jordan 

Family, Friends 

  Folder
Baby, at 10 hours old (F.C. Jordan, photographer: July 19, 1898) 9
  Folder
Boy and wagon (July 19, 1900) 10
  Folder
Boy (May 24, 1901) 11
  Folder
Boy (6:00 P.M. June 3, 1901) 12
  Folder
Family group at Maplewood (1908) 13
  Folder
Hattie at Picnic, Decoration Day (1909) 14
  Folder
Jordan house, 49 Riverview Ave. 15
  Folder
Jordan house, (north side) 16
  Folder
Jordan house, (south side) 17
  Folder
Jean and Andrew with snowman (1910) 18
  Folder
Interior, F. Jordan dining room (J.H. Jordan, photographer) 19
  Folder
Interior, F.C. Jordan parlor (J.H. Jordan, photographer) 20
  Folder
Mr. And Mrs. Frank C. Jordan on porch of home (Lantern slide) 21
  Folder
Group at grandfather Craig's 22
  BoxFolder
House, 49 Observatory Ave. (May 30, 1912) 81
  Folder
Jordan family on porch, 49 Riverview Ave. 2
  Folder
F. Jordan and F.E. Vincent at 49 Observatory Ave. (August 18, 1912) 3
  Folder
John William, (August 3, 1912) 4
  Folder
Lightning, from rear porch, 49 Observatory Ave. (August 18, 1912) 5
  Folder
F.E. Vincent, 49 Observatory Ave. (August 19, 1912) 6
  Folder
John William, his dad and mama (November 28, 1912) 7
  Folder
John William with father and grandfather 8
  Folder
Jean in Martha Washington gown (February 22, 1913) 9
  Folder
F.C. Jordan in costume 10
  Folder
Hattie and F.C. in old fashioned pose 11
  Folder
Campfire girls' play 12
  Folder
Campfire girls, Wissahicken Hollow 13
  Folder
Group at Sewickley, 706 Nevin Ave 14
  Folder
A.J. Good (April 1, 1913) 15
  Folder
A.J. Good and mother (April 1, 1913) 16
  Folder
H.J. Heckel, Maryville picnic (June 13, 1913) 17
  Folder
Jean on Observatory walk (February 25, 1914) 18
  Folder
MacIvor and Jordan family and Dr. Martin (June 1914) 19
  Folder
The Armstrong house (July 4, 1914) 20
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Krom House (July 4, 1914) 91
  Folder
The Krom family (July 4, 1914) 2
  Folder
The whole family (April 25, 1915) 3
  Folder
Andrew as Uncle Sam (May 30, 1915) 4
  Folder
Harriet and F.C. Jordan (November 25, 1915) 5
  Folder
Thanksgiving, Harriet and F.C. Jordan, Andrew, Will and Sadie (1915) 6
  Folder
Group at Aunt Mary Reed's (July 19, 1916) 7
  Folder
John William with dog 8
  Folder
Interior at Cheswick (February 8, 1917) 9
  Folder
John William (1918) 10
  Folder
John William at desk (April 21, 1918) 11
  Folder
Dr. F. C. Jordan in a silk hat (April 21, 1918) 12
  Folder
Group at Beaver (July 19, 1918) 13
  Folder
Foundations of house at Beaver 14
  Folder
Rosecroft, S.E. front 15
  Folder
House at Beaver from southwest (July 22, 1918) 16
  Folder
Andrew (July 22, 1918) 17
  Folder
Rosecroft 18
  Folder
Fireplace at Rosecroft 19
  Folder
Family group on porch, Rosecroft, Beaver, PA 20
  Folder
Flower garden at Beaver 21
  Folder
Group working in flowers at Beaver, PA. (July 25, 1918) 22
  BoxFolder
Garage at Beaver, PA. (July 25, 1918) 101
  Folder
Family group on rocks at Beaver, PA. 2
  Folder
M.E. Church, Children's Day (June 11, 19_) 3
  Folder
Watson Church, Harvest House decorations (November 2, 1919) 4
  Folder
Watson church, Harvest Home decorations (November 2, 1919) 5
  Folder
John William at telescope (November 14, 1919) 6
  Folder
Jean, Observatory steps (January 1, 1921) 7
  Folder
F.C. Jordan. (February 12, 1921) 8
  Folder
"Sandy" and Catherine Lamb in living room, Cheswick (March 12, 1921) 9
  Folder
"Sandy" Lamb 10

Views in Ohio 

  Folder
Snow scene, 49 Riverview (March 4, 1922) 11
  Folder
Ohio Company's office, Washington St. (F.C. Jordan, photographer: December 29, 1898) 12
  Folder
Mound Cemetery, from north, Charlie Carothers on the steps (F.C. Jordan, photographer: December 28, 1898) 13
  Folder
Mound Cemetery 14
  Folder
University Hall, Ohio State University (August 22, 1899) 15
  Folder
Ohio State University grounds (August 22, 1899) 16
  Folder
Orton Hall and Biology Lab, Ohio State University (August 22, 1899) 17
  Folder
Deaf and Dumb Asylum, Columbus, Ohio (August 23, 1899) 18
  Folder
Death Cell, Ohio State Penitentiary 19
  Folder
Picnic group at Fredericktown, Ohio (May 30, 1909) 20
  Folder
Children fishing, Fredericktown, Ohio (1909) 21
  Folder
Indian carvings, Smith's Ferry, Ohio (1909) 22
  Folder
Children, East Liverpool, Ohio (1909) 23
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Family group on rocks, Smith's Ferry, Ohio (1909) 111
  Folder
House and family at East Liverpool, Ohio (1909) 2
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Old Caywood house, Wheeler house (July 19, 1916) 3
  Folder
Caywood house, Washington County, Ohio. 4
  Folder
Caywood house, Hills P.O. 5
  Folder
Marietta and river from Harmer Hill, Ohio 6
  Folder
Mill at Beverly, Ohio 7
  Folder
House 618, Second St., Marietta, Ohio 8

Views in Wisconsin 

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Reflector dome and Lake Geneva, Yerkes Observatory 9
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Lake Geneva, from top of Yerkes Observatory, looking east 10
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Yerkes Observatory 11
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2 foot reflector, Yerkes Observatory. 12
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Yerkes group (1907) 13
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Yerkes group 14

Views in Colorado 

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Chamberlin Observatory (June 8, 1918) 15-17
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Mountains from Chamberlin Observatory (June 8, 1918) 18
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Clock at Knob Hill Station, Colorado Springs 19
  Folder
Cooke camera at Knob Hill, Colorado Springs 20
  Folder
Range south of Pike's Peak, from Knob Hill 21
  BoxFolder
Pike's Peak and range from Knob Hill (June 9, 1918) 121
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Pike's Peak and range (June 9, 1918) 2-3
  Folder
Train on Midland Road, base of Pike's Peak 4
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Engine, Pike's Peak Cog Road 5
  Folder
Pike's Peak Cog Road, near half-way house 6
  Folder
Looking down along Pike's Peak Cog Road 7
  Folder
Pike's Peak Cog Road, ascending curve 8
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Manitou and front range, Pike's Peak region 9
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Geology class at Manitou ready to go up to Lake Moraine 10
  Folder
Bald Mountain from Lake Moraine 11
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Williams Canyon, Manitou, Colorado 12
  Folder
Rocks in Williams Canyon. 13
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Amphitheater, Williams Canyon, Manitou, Colorado 14
  Folder
Pavilion at Manitou, Soda Springs. 15
  Folder
Geology class at Seven Falls, South Cheyenne Canyon 16
  Folder
View from top of Seven Falls, Cheyenne Canyon 17
  Folder
Father and Uncle Spence at top of Seven Falls 18
  Folder
South Cheyenne Canyon, Colorado Springs 19
  Folder
Family group, South Cheyenne canyon 20
  BoxFolder
Ice in South Cheyenne Canyon 131
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"Needless," North Cheyenne Canyon 2
  Folder
Cheyenne Mountain. (June 9, 1918) 3
  Folder
Cheyenne Mountain, from the west 4
  Folder
Cheyenne Mountain, from Canyon Park 5
  Folder
Valley west of Cheyenne Mountain, Colorado Springs 6
  Folder
Plains, Colorado Springs, east from Knob Hill 7
  Folder
Plains south of Colorado Springs, Cheyenne Canyon 8
  Folder
Family group at cabin, St. Peter's Dome, Colorado Springs 9
  Folder
St. Peter's Dome, Colorado Springs 10
  Folder
Geology class, Red Rock Canyon, Colorado Springs 11
  Folder
Geology class in Garden of the Gods 12
  Folder
Gateway, Garden of the Gods 13
  Folder
Rocks in Garden of the Gods 14
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Balanced Rock, Garden of the Gods 15
  Folder
Rocks in Garden of the Gods (Seal and Bear) 16
  Folder
Group in Garden of the Gods, at Siamese Twins 17
  Folder
Profile Rock, Garden of the Gods 18
  Folder
Rocks in Monument Park, Colorado 19
  Folder
"Quaker Wedding," Monument Park, Colorado 20
  Folder
Cox house and group, Colorado Springs 21
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High School, Colorado Springs 22
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On Tennessee Pass, near Leadville, Colorado 141

Views in the West 

  Folder
Along the Union Pacific (March 1900) 2
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Sagebrush plains, Wyoming or Idaho 3
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Sacramento State House 4
  Folder
Ground, State House, Sacramento 5

Various Views 

  Folder
Oil field, Moore's Junction (F.C. Jordan, photographer: December 30, 1898) 6
  Folder
Houses at toll gate, 9 miles from government camp (6 A.M. September 2, 1900) 7
  Folder
Multiple lightning flash (F.C. Jordan photographer: August 27, 1904) 8
  Folder
208 Club 9
  Folder
Mr. Barnhard's observatory (May 4, 1907) 10
  Folder
Bi-plane 11
  Folder
Red Cross nurse at "Flu" hospital 12
  Folder
Indian Mound at Oakmont, beginning of operations (October 4, 1895) 13
  Folder
Indian Mound Oakmont (October 4, 1895) 14
  Folder
Indian Mound Oakmont, from west (October 4, 1895) 15
  Folder
View toward Schoenberger Iron Works in Strip District, from base of P. Ft. W. C. Ry. Bridge (c. 1900) 16
  Folder
Pittsburgh fireworks (July 4, 1901) 17
  Folder
Phipps Conservatory, North Side 18
  Folder
208 Club 19
  BoxFolder
Perry High School, from Perrysville Ave. 1515
  Folder
Looking west above Perrysville Ave., up plank road. 2
  Folder
Backyard telescope 3
  Folder
Residence of Major Speer, Oakmont, Pa., October 4, 1895 4
  Folder
Parlour, Residence, JEK 5-6
  Folder
Austin Bluffs, Colorado Springs 7

New Material Added, 2013 

  BoxFolder
Thaw Refracter Negatives, March 9, 1972 1816

Subseries  2. Photographic Prints 

  BoxFolder
Dr. Brashear 161-6
  Folder
Dr. Brashear's Wife 7
  Folder
Dr. Brashear's Mother 8
  Folder
Dr. Brashear with Alexander Graham Bell and Others 9
  Folder
Brashear Memorial Subscription Book Signing 10
  Folder
Allegheny Observatory 11-12
  Folder
First Photograph of the Nebula in Orion 13
  Folder
Photograph of the Nebula in Orion 14
  Folder
William Thaw (negative available) 15
  BoxFolder
Miscellaneous Allegheny Observatory Prints 171
  Folder
Miscellaneous Instruments 2
  Folder
Miscellaneous Individuals 3
  Folder
Miscellaneous Observations 4
  Folder
Various Views 5

New Material Added, 2013 

  BoxFolder
30 inch Keeler Telescope 181-2
  Folder
Thaw Telescope (No. 3123A) 3

Photographs of the Thaw Telescope taken by George Plaetvich. Date Unknown.

  Folder
Telescope Components, March, 1973 4

Photographs taken by George Vargo, March 1973.

  Folder
Photograph used in Publication, 1968 5

Photograph of Researchers in front of image tubes display, 1968 (?) L-R: Joost H. Kiewiet de Jonge, Wallace R. Beardsley, and J.R. Hansen.

  Folder
Basement - Library Photographs 6-7
  Folder
Gaertner Scientific - M1233 Comparator (A & B) 8
  Folder
Grant - Measuring Machines 9
  Folder
Grant Data System 10
  Folder
Riddell Scientific Instrument - Williams Bay, Wis. 11
  Folder
Small Brashear Measuring Engine 12
  Folder
Iron Spectrum - Vatican Atlas 13
  Folder
Spectrum Enlargements 14
  Folder
Thaw Dome, August 1972 15

Photographs of the Thaw Dome with Scaffolding. Taken August 1972.

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Series  XVII. Student Records, 1960-1977 

Access Restrictions

Access restricted without signed confidentiality agreement.

  BoxFolder
Barrick, John 781
  Folder
Breakiron, Lee 2
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Caglayan, Aybars 3
  Folder
Engel, Thomas 4
  Folder
Fluharty, John R. 5
  Folder
Gatewood, George 6
  Folder
Gault, Andrew 7
  Folder
Gbur, Nicholas J. 8
  Folder
Giannini, Judith 9
  Folder
Grimble, Ralph E. 10
  Folder
Hayes, James C. 11
  Folder
Jett, James Eric 12
  Folder
Jones, George W. 13
  Folder
Kamper, Karl W. 14
  Folder
Kimmel, Frank W. 15
  Folder
King, Merle 16
  Folder
Kipp, Steven 17
  Folder
Kirshnawamy, Parvalthi 18
  Folder
Lavie, Aharon 19
  Folder
Lippert, Kenneth B. 20
  BoxFolder
Mechler, Gary 791
  Folder
Mesrobian, William S. 2
  Folder
Mousseau, Robert 3
  Folder
Nelson, Robert M. 4
  Folder
Olejniczak, Paul J. 5
  Folder
Peters, Lawrence E. Jr. 6
  Folder
Parise, Ronald Anthony 7
  Folder
Parks, Allen D. 8
  Folder
Russel, Jane 9
  Folder
Schwab, Harry L. 10
  Folder
Sprinkle, Thomas G. 11
  Folder
Stein, John William 12
  Folder
Tepper, Lawrence J. 13
  Folder
Trybula, Walter 14
  Folder
Urbaniak, John J. 15
  Folder
Vaerewyck, Eugene G. 16
  Folder
Worek, Thaddeus 17
  Folder
Zajdel, Theodore T. J. 18
  Folder
Ziska, Eugene R. 19

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