Surveyor's Transit
date: label: date made
content: 1886-1908
name: label: maker
content: W. & L. E. Gurley
notes: label: Description
content: This is marked "W. & L. E. Gurley, Troy, N.Y." Gurley described it 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. A clamp and tangent to the telescope axis are present, as well as a gradienter attachment for determining gradients, distances, and differences of level. A variation scale on the face of the compass extends 35 degrees either way; the vernier reads to single minutes. The telescope has a fitting for a solar attachment. It was made after 1886, when Gurley introduced the bent standards, and before the introduction of serial numbers in 1908.
label: Description
content: Ref: W. & L. E. Gurley, <i>Manual of the Principal Instruments used in American Engineering and Surveying</i> (Troy, N.Y., 1904), pp. 33-36 and 259.
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
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content: Measuring & Mapping
publisher: label: Related Publication
content: W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 37th Edition
creditLine: label: Credit Line
content: New York University.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.335223
label: accession number
content: 314672
label: catalog number
content: 335223
objectType: label: Object Name
content: surveyor's transit
physicalDescription: label: Measurements
content: overall: 15 in; 38.1 cm
label: Measurements
content: horizontal circle: 7 in; 17.78 cm
label: Measurements
content: needle: 4 1/2 in; 11.43 cm
label: Measurements
content: vertical circle: 4 1/2 in; 11.43 cm
label: Measurements
content: telescope: 11 1/2 in; 29.21 cm
label: Measurements
content: hanging level: 6 in; 15.24 cm
label: Measurements
content: overall in case: 15 in x 12 3/4 in x 8 5/8 in; 38.1 cm x 32.385 cm x 21.9075 cm