Gurley Surveyor's Compass

Description
This resembles Gurley’s small vernier compass but has no vernier mechanism. The outer rim of the box is graduated to single degrees, and numbered every 10 degrees. The instrument can be used with the folding sights raised to the vertical, or with the sighting bar. In the latter case, the folding sights are folded towards each other, to form a tent, and the sighting bar attached on top. The sighting bar is equipped with a vertical circle graduated to single degrees. This form has not been found listed or described in any Gurley trade literature. The "W. & L. E. Gurley, Troy, N.Y." inscription was engraved by machine, dating it to after 1876.
Location
Currently not on view
Object Name
surveyor's compass
maker
W. & L. E. Gurley
Measurements
needle: 3 1/2 in; 8.89 cm
sighting bar: 9 in; 22.86 cm
vertical circle: 3 in; 7.62 cm
place made
United States: New York, Troy
ID Number
1982.0701.06
accession number
1982.0701
catalog number
1982.0701.06
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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