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*247915

Dimensions:
length 23 inches; height 2.75 inches

Discussion:
This is a cherry bar with folding brass sights located near either end and centered on one beveled edge. The other beveled edge is graduated to quarter inches. The United States Geological Survey transferred this instrument to the Smithsonian in 1907.

Further Information:

Alidade

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