Smithsonian - National Museum of American History, Behring Center

Physical Sciences Collection - Surveying and Geodesy

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Geodetic Transit - click to enlarge

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Geodetic Transit

Catalogue number:

"Troughton & Simms, London 2"

telescope 2.375 inches aperture, 31 inches long; striding level 18 inches; vertical circle 5 inches diameter


This instrument, which the United States War Department transferred to the Smithsonian in 1933, was probably used by the Army Topographical Engineers. It was made by Troughton & Simms in London, perhaps as early as the 1840s. It has a double-cone horizontal axis, a lamp for illuminating this axis, a large striding level, a small vertical circle at one end of the horizontal axis, and an iron base.

Further Information:

Geodetic Transit
Troughton & Simms