Troughton & Simms Geodetic Transit

Troughton & Simms Geodetic Transit

Usage conditions apply
This instrument, which the U. S. War Department transferred to the Smithsonian in 1933, was probably used by the Army Topographical Engineers.It is marked "Troughton & Simms, London 2" and was made 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.
Currently not on view
Object Name
geodetic transit
Troughton and Simms
place made
United Kingdom: England, London
telescope: 31 in; 78.74 cm
aperture: 2 3/8 in; 6.0325 cm
striding level: 18 in; 45.72 cm
vertical circle: 5 in; 12.7 cm
ID Number
accession number
catalog number
Credit Line
War Department
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
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