Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

Browse Makers | Browse Instruments | Index

Back
 

Alidade - click to enlarge

Click photos to enlarge.

Alidade

Catalogue number:
PH*335213

Inscriptions:
"BUFF & BERGER BOSTON 2157"

Dimensions:
telescope 17 inches long

Discussion:

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. Buff & Berger were in business together from 1871 to 1898.

Ref: Buff & Berger, Hand-Book and Illustrated Catalogue of the Engineers' and Surveyors' Instruments (Boston, 1890), p. 104b.

Further Information:

Alidade
Buff & Berger

Back