Theodolite
name: label: maker
content: Kern & Co.
notes: label: Description
content: Heinrich Wild designed this DKM2 (a double-circle theodolite with an optical micrometer) 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 2 scales are read through the optical micrometer with reference to a centrally located index, giving the arithmetic mean of 2 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 81066 DKM2." It was probably made in the 1960s, and it came to the Smithsonian in 1979.
label: Description
content: Ref: Kern & Co., Ltd, <i>Double Circle Theodolites</i> (about 1959).
label: Location
content: Currently not on view
place: label: place made
content: Switzerland
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Surveying and Geodesy
label: See more items in
content: Measuring & Mapping
publisher: label: Related Publication
content: Kern & Co., Ltd.. Double Circle Theodolites
creditLine: label: Credit Line
content: Computer Sciences Corp.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.337212
label: catalog number
content: 337212
label: accession number
content: 1979.0809
objectType: label: Object Name
content: theodolite
physicalDescription: label: Measurements
content: overall: 8 1/4 in; 20.955 cm
label: Measurements
content: overall in case: 11 5/8 in x 6 3/4 in x 4 3/4 in; 29.5275 cm x 17.145 cm x 12.065 cm