Geodetic Transit
date: label: date made
content: late 1840s
name: label: maker
content: Troughton and Simms
notes: label: Description
content: This 30-inch transit was made by Troughton & Simms in London for the U. S. Coast Survey, probably in the late 1840s. Only the unusually short trunnions, telescope, small vertical circle, and micrometer eyepiece remain. The standards, graduated horizontal circle, and tripod base are missing.
label: Description
content: Ref: C. A. Schott, "Determination of the Astronomical Azimuth of a Direction," <i>United States Coast Survey Annual Report</i> (1866), Appendix No. 11.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London
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: United States Coast Survey. United States Coast Survey Annual Report
creditLine: label: Credit Line
content: U.S. Coast and Geodetic Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.316510
label: accession number
content: 225703
label: catalog number
content: 316510
objectType: label: Object Name
content: theodolite
label: Object Name
content: Geodetic Transit
physicalDescription: label: Measurements
content: telescope aperture: 2 3/8 in; 6.0325 cm
label: Measurements
content: telescope: 30 in; 76.2 cm
label: Measurements
content: vertical circle: 5 1/2 in; 13.97 cm
label: Measurements
content: trunions: 12 1/2 in; 31.75 cm
label: Measurements
content: overall: 5 3/4 in x 33 in x 10 in; 14.605 cm x 83.82 cm x 25.4 cm