Gurley Solar Transit

Description
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. The signature reads "W. & L. E. Gurley Troy, N.Y., U.S.A." and "461261."
Gurley produced its first example 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 Joseph C. Thoma, 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.
Location
Currently not on view
Object Name
solar transit
maker
W. & L. E. Gurley
Physical Description
brass (overall material)
glass (overall material)
Measurements
overall: 13 in; 33.02 cm
place made
United States: New York, Troy
ID Number
1991.0809.01
accession number
1991.0809
catalog number
1991.0809.01
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
cited
W. & L. E. Gurley. Manual of Surveying Instruments
W. & L. E. Gurley. Gurley Telescopic Solar Transit

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