Surveyor's Transit
name: label: maker
content: W. & L. E. Gurley
notes: label: Description
content: Gurley described this as a Surveyor's Transit with two verniers to the horizontal limb. The horizontal and vertical circles are silvered, graduated every 30 minutes of arc, and read by verniers to single minutes. There is a clamp and tangent to the telescope axis. A variation scale on the face of the compass extends 30 degrees either way; the double folded vernier reads to single minutes. The transit is easily detached from the leveling head, and the two are stored separately in the box. Since the "W. & L. E. Gurley, Troy, N.Y." inscription was engraved by hand, this transit was made between 1852, when Gurley began in business, and 1876, when Gurley's new engraving machine was up and running.
label: Description
content: Ref: W. & L. E. Gurley, <i>Manual of the Principal Instruments used in American Engineering and Surveying</i> (Troy, N.Y., 1871).
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
publisher: label: Related Publication
content: W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 17th Edition
creditLine: label: Credit Line
content: UOP Inc.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0701.07
label: accession number
content: 1982.0701
label: catalog number
content: 1982.0701.07
objectType: label: Object Name
content: surveyor's transit
physicalDescription: label: Measurements
content: overall: 12 in; 30.48 cm
label: Measurements
content: horizontal circle: 6 3/4 in; 17.145 cm
label: Measurements
content: needle: 5 in; 12.7 cm
label: Measurements
content: vertical circle: 4 1/4 in; 10.795 cm
label: Measurements
content: telescope: 11 in; 27.94 cm
label: Measurements
content: hanging level: 5 1/2 in; 13.97 cm
label: Measurements
content: overall in case: 13 in; 33.02 cm