Gurley Alidade

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.
Currently not on view
Object Name
W. & L. E. Gurley
overall: 4 1/2 in x 18 in; 11.43 cm x 45.72 cm
place made
United States: New York, Troy
ID Number
catalog number
accession number
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Geological Survey

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