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Published

Leeds & Northrup Company, Philadelphia (29)
C. F. Casella & Co. Ltd., London (27)
Carl Zeiss, Jena, Germany (20)
Carl Leiss, Berlin (18)
Fairchild Aerial Camera Corporation, New York (17)
Spencer Lens Company, Buffalo, NY (17)
Bausch & Lomb Optical Co., Rochester, NY (13)
R. Fuess, Berlin (11)
Cooper Hewitt Electric Co., Hoboken, NJ (10)
Weston Electrical Instrument Corporation, Newark, NJ (8)
R. & J. Beck, Ltd., London (7)
Cooke, Troughton & Simms, Ltd., London (6)
E. Ducretet et Cie, Paris (5)
E. R. Watts & Son, Ltd., London (5)
Honeywell, Inc., Denver, CO (5)
Max Kohl A.-G., Chemnitz, Germany (4)
Optisches Museum, Jena, Germany (4)
Spencer Lens Company, Boston, MA (4)
Zeiss Ikon, Dresden, Germany (4)
Arthur H. Thomas Company, Philadelphia (3)
Aug. Bel & Co., London (3)
Burghley House, Stamford, UK (3)
Carl Zeiss, Inc., New York (3)
Chicago Apparatus Co., Chicago (3)
Consolidated Machine Specialty Co., Boston (3)
E. Leitz, Inc., NY (3)
General Radio Company, Cambridge, MA (3)
General Radio Company, West Concord, MA (3)
Harvard University, Cambridge, MA (3)
Henry Hughes & Son, Ltd., London (3)
Hess-Ives Corporation, Philadelphia, PA (3)
James A. Sinclair & Co. Ltd., London (3)
James J. Hicks, London (3)
Jarrell-Ash Company/Boston, MA (3)
Spencer Lens Co., Boston (3)
Spencer Lens Co., Buffalo, NY (3)
Spencer Lens Company, Boston (3)
Universal Scientific Company, Inc., Vincennes, IN (3)
Western Electric Company, New York (3)
Wild Heerbrugg Limited, Heerbrugg, Switzerland (3)
A. T. Thompson & Company, Manufacturers, Boston (2)
Abrams Instrument Company, Lansing MI (2)
Adam Hilger, Ltd., London (2)
Allen B. DuMont Laboratories, Inc., Passaic, NJ (2)
Apps, London (2)
Beijing Ancient Obervatory, Beijing (2)
Brooklyn Thermometer Company, New York (2)
C. Baker, London (2)
Carl Zeiss, Jena (2)
Central Scientific Company, Chicago, IL (2)

Year *

0 (1,001)

Thesaurus

Lib-3f (75)
Microscopes (67)
Computer -- History (65)
Electricity (58)
C3-D4 (54)
C5-H1 (46)
C6-A1 (44)
C3-D1 (43)
C5-A3 (41)
C6-A2 (41)
Optical Instruments (40)
C5-D3 (35)
Scientific Instruments (30)
C4-H1 (28)
C5-E1 (28)
Electronics (26)
Leeds & Northrup Company (26)
Photography (25)
C. F. Casella & Co. Ltd. (25)
C3-F1 (25)
C5-C1 (24)
Subjects (23)
C3-D3 (23)
C6-B1 (22)
Spencer Lens Company (21)
Radio (21)
Optics (20)
C3-F2 (20)
C5-G3 (20)
Astronomy (19)
C5-B1 (19)
C5-H2 (19)
Carl Leiss (18)
C4-B4 (18)
C5-F1 (18)
Galvanometers (17)
Graduating Engines -- Wurdemann (17)
photography -- aerial (17)
C4-A2 (17)
C4-G1 (17)
Vacuum Tubes (16)
C4-G4 (16)
Physics (15)
Bausch and Lomb (15)
Graduating Engines -- Heyde (15)
C5-H3 (15)
Surveying (14)
Carl Zeiss, Jena (14)
C4-F1 (14)
C5-B2 (14)
Image Not Available

The Laboratory

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Articles on American Astronomy: "The Origin of North American Astronomy -- Seventeenth Century" and "Accuracy of Planetary Theories, Particularly of Mars"

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Construction geometrique des cadrans solaires de direction

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Plates on Magnetism and Electric Currents, from a German book

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The Ghosts in the Instrument

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Autour d'un objet du musee

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The Astronomical Clocks of Andreas Hohwü: A Checklist

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Photographs of astronomical instruments, Museo Naval Madrid

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Colonial Astronomers in Search of the Longitude of New England

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300 Jahre Harrison-Symposium, Harvard University / 300th Anniversary Harrison Symposium, Harvard University

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Voyage D'Angleterre 1763, Microfiche Copies of Manuscript Writings and Images

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Tomorrow's Battery Today

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