Theodolite (T3)

Description:

Heinrich Wild's Precision Theodolite, introduced in 1925 and later known as the T3, is a geodetic version of the T2. The horizontal and vertical circles are glass, and read directly to .2 seconds. The telescope has a range of 20-60 miles. With some modifications, the T3 remained in production for about 50 years.

The U. S. Coast and Geodetic Survey described the T3 as a "satisfactory first-order instrument" suitable for the most exacting survey work. The U. S. Army published a detailed account of the maintenance and use of the T3 in 1963. The Geodetic Survey Squadron, a branch of the U. S. Air Force that became part of the U. S. Defense Mapping Agency when that organization was formed in 1972, used T3s to provide orientation at launch sites for missiles and satellites.

The National Imagery and Mapping Agency, successor to DMA, transferred this example to the Smithsonian in 2000. It was apparently purchased in 1969, and has its original airtight and watertight steel case, and its original wooden shipping case. The signature reads "WILD HEERBRUGG SWITZERLAND T-3 91599." Other markings read "1969 US" and "CONTR DSA-700-69-C-G570 FSN 6675-411-5446." A decal on the shipping case reads "DEFENSE MAPPING AGENCY, GEODETIC SURVEY SQUADRON."

Ref: Wild, The New Precision-Theodolite Wild T3 (Heerbrugg, 1939).

Maker: Wild

Location: Currently not on view

Place Made: Switzerland

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

Exhibition:

Exhibition Location:

Related Publication: Wild. New Percision-Theodolite Wild T3

Credit Line: U.S. Department of Defense, National Imagery and Mapping Agency, Geodesy and Geophysics Department

Data Source: National Museum of American History

Id Number: 2000.0257.09Accession Number: 2000.0257Catalog Number: 2000.0257.09

Object Name: theodolite

Measurements: overall: 14 1/2 in; 36.83 cmhorizontal circle: 5 1/2 in; 13.97 cmvertical circle: 3 3/4 in; 9.525 cmtelescope aperture: 2 23/32 in; 6.9342 cmtelescope: 10 1/4 in; 26.035 cm

Guid: http://n2t.net/ark:/65665/ng49ca746a5-898f-704b-e053-15f76fa0b4fa

Record Id: nmah_747913

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