Alidade

Alidade

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Description
This alidade belonged to Columbia University. Its vertical arc, which extends 35 degrees either way, is graduated to 30 minutes and read by vernier to 2 minutes. The base has a skeletal structure, making it light and stiff. There is a separate striding level and trough compass. The "BUFF & BERGER BOSTON 2157" inscription refers to a firm that traded, as such, from 1871 to 1898.
Ref: Buff & Berger, Hand-Book and Illustrated Catalogue of the Engineers' and Surveyors' Instruments (Boston, 1890), p. 104b.
Location
Currently not on view
Object Name
alidade
date made
1871-1898
maker
Buff & Berger
place made
United States: Massachusetts, Boston
Measurements
telescope: 17 in; 43.18 cm
overall: 5 in x 22 3/4 in x 10 1/4 in; 12.7 cm x 57.785 cm x 26.035 cm
ID Number
PH.335213
catalog number
335213
accession number
317998
Credit Line
Columbia University
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
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