Buff & Berger Altitude and Azimuth Instrument

Description
This belonged to the John C. Green Astronomical Observatory at Princeton University. New, it cost $680. The horizontal circle is silvered, graduated to 20 minutes, and read by opposite verniers with magnifiers and ground glass plates to 20 seconds. The vertical circle is silvered, graduated to 20 minutes, and read by opposite verniers with magnifiers and ground glass plates to single minutes. The telescope has a filar micrometer eyepiece; the attached level has a micrometer adjustment. The signature reads: "Buff & Berger, Boston No. 159."
George L. Buff and Christian Louis Berger went into business in Boston in 1871, manufacturing "all kinds of surveying, astronomical, mathematical and philosophical instruments." Buff & Berger was remarkably successful, attracting numerous customers, and winning awards at state and national exhibitions. The firm was dissolved in 1898, and succeeded by Buff & Buff and by C. L. Berger & Sons.
Ref: Buff & Berger, Hand Book and Illustrated Catalogue of the Engineers' and Surveyors' Instruments (Boston, 1890), p. 129.
Location
Currently not on view
Object Name
altitude and azimuth instrument
maker
Buff & Berger
Measurements
overall: 11 1/2 in; 29.21 cm
horizontal circle: 8 in; 20.32 cm
vertical circle: 5 1/4 in; 13.335 cm
telescope: 11 1/2 in; 29.21 cm
level: 6 in; 15.24 cm
place made
United States: Massachusetts, Boston
ID Number
1983.0245.01
accession number
1983.0245
catalog number
1983.0245.01
subject
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Princeton University
cited
Buff & Berger. Hand-book and Illustrated Catalogue of the Engineers' and Surveyors' Instruments, Made by Buff & Berger

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