Theodolite

Description
This instrument, sometimes referred to as a 12–inch repeating circle, was made in the Instrument Division of the U. S. Coast Survey. It is marked "U. S. C. S. No. 100" and dates from before 1878, when the Coast Survey became the Coast and Geodetic Survey. The horizontal circle is graduated to 10 minutes, and read by opposite verniers and magnifiers to 6 seconds.
Ref: C. A. Schott, "Determination of the Astronomical Azimuth of a Direction," United States Coast Survey Annual Report (1866), Appendix No. 11.
Location
Currently not on view
Object Name
theodolite (geodetic)
Measurements
horizontal circle: 12 in; 30.48 cm
telescope aperture: 2 3/8 in; 6.0325 cm
telescope: 24 in; 60.96 cm
ID Number
PH*316513
accession number
225703
catalog number
316513
subject
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
cited
United States Coast Survey. United States Coast Survey Annual Report

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