Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Alidade - click to enlarge

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Alidade

Catalogue number:
PH*252974

Inscriptions:
"W. & L. E. Gurley Troy, N.Y." and "U.S.G.S. 182"

Dimensions:
length 18 inches; height 4.5 inches

Discussion:

This is a simple brass rule with beveled edge and short folding sights at either end. The United States Geological Survey transferred it to the Smithsonian in 1909.

Further Information:

Alidade
Gurley

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