Alidade

Description
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 U.S. Geological Survey transferred it to the Smithsonian in 1907.
Location
Currently not on view
Physical Description
wood (overall material)
brass (overall material)
Measurements
overall: 2 3/4 in x 23 in; 6.985 cm x 58.42 cm
overall arms folded down: 11/16 in x 23 in x 1 7/8 in; 1.74625 cm x 58.42 cm x 4.7625 cm
ID Number
PH*247915
catalog number
247915
accession number
47736
Credit Line
U.S. Geological Survey
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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