Kern Theodolite

Description
The DKM2 is a double-circle theodolite with an optical micrometer. Heinrich Wild developed the form for Kern in the 1930s. Like the T2 manufactured by Wild in Heerbrugg, the DKM2 is a lightweight instrument with a steel frame. The horizontal and vertical circles are glass, and read directly to single seconds. The telescope is equipped with stadia wires, and so can be used for tachymetry. An auxiliary eyepiece lying alongside the telescope allows the user to read either circle without moving away from the station. Here, however, the two scales are read through the optical micrometer with reference to a centrally located index, giving the arithmetic mean of two diametrically opposed points on the circle. In 1955, an instrument of this sort, with tripod, cost $1,221. This example is marked "Kern AARAU SUISSE SWITZERLAND No 37845 DKM2." It was purchased in 1963, and given to the Smithsonian in 1997.
Ref: Kern & Co., Ltd, Double Circle Theodolites (about 1959).
Location
Currently not on view
Object Name
theodolite
maker
Kern & Co.
Measurements
overall: 8 1/4 in; 20.955 cm
place made
Switzerland
ID Number
1997.0290.04
accession number
1997.0290
catalog number
1997.0290.04
subject
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
cited
Kern & Co., Ltd.. Double Circle Theodolites

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