Gurley Alidade

Description
This is a simple brass rule with beveled edge and short folding sights at either end. It is marked "W. & L. E. Gurley Troy, N.Y." and "U.S.G.S. 182." The U. S. Geological Survey transferred it to the Smithsonian in 1909.
Location
Currently not on view
Object Name
alidade
maker
W. & L. E. Gurley
Measurements
overall: 4 1/2 in x 18 in; 11.43 cm x 45.72 cm
place made
United States: New York, Troy
ID Number
PH*252974
catalog number
252974
accession number
49676
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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