Surveyor's Compass
name: label: maker
content: W. & L. E. Gurley
notes: label: Description
content: 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.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Troy
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Surveying and Geodesy
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: UOP Inc.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0701.06
label: accession number
content: 1982.0701
label: catalog number
content: 1982.0701.06
objectType: label: Object Name
content: surveyor's compass
physicalDescription: label: Measurements
content: needle: 3 1/2 in; 8.89 cm
label: Measurements
content: sighting bar: 9 in; 22.86 cm
label: Measurements
content: vertical circle: 3 in; 7.62 cm
label: Measurements
content: overall: 4 3/4 in x 10 1/16 in x 7 13/16 in; 12.065 cm x 25.55875 cm x 19.84375 cm