Surveyor's Transit


This is a Standard Precise Transit, Reconnaissance Model (#112-T), with a telescopic solar unit attached to one standard "as constructed for the Bureau of Land Management." It can be used for standard surveys, as well as for determining the solar meridian quickly and efficiently. Inscriptions read "W. & L. E. Gurley Troy, N.Y., U.S.A." and "461261."

Gurley produced its first example of this form in June 1946, basing it on specifications that the General Land Office (the predecessor of the Bureau of Land Management) had published in June 1944. The "Jos. C. Thoma” inscription on this example refers to a General Land Office surveyor who made substantial contributions to its design. Thoma’s widow transferred it to Clyde N. Eldridge, a surveyor and aerial photogrammetrist in Barnesville, Ga., and Eldridge’s brother donated it to the Smithsonian in his memory.

Ref: W. & L. E. Gurley, The Gurley Telescopic Solar Transit (Troy, N.Y., 1959).

W. & L. E. Gurley, Manual of Surveying Instruments (Troy, N.Y., 1951), p. 123.

“Joseph C. Thoma, Government Surveyor” Washington Post (Feb. 1, 1967), p. C6.

Maker: W. & L. E. Gurley

Location: Currently not on view

Place Made: United States: New York, Troy

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Related Publication: W. & L. E. Gurley. Manual of Surveying Instruments, W. & L. E. Gurley. Gurley Telescopic Solar Transit

Credit Line: Albert M. Eldridge in memory of Clyde N. Eldridge

Data Source: National Museum of American History

Id Number: 1991.0809.01Accession Number: 1991.0809Catalog Number: 1991.0809.01

Object Name: solar transit

Physical Description: brass (overall material)glass (overall material)Measurements: overall: 13 in; 33.02 cmoverall in case: 15 3/4 in x 9 1/2 in x 9 1/2 in; 40.005 cm x 24.13 cm x 24.13 cm


Record Id: nmah_997302

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