Subtense Bar
name: label: maker
content: Wild, Heinrich
notes: label: Description
content: A subtense bar is a bar of known length, with targets at either end. It is usually made of a stable material such as invar (an iron-nickel alloy). When used with a theodolite, it serves as a quick and convenient method of measuring distances indirectly. The subtense technique is similar to that involving a tachymeter and graduated rod. Subtense bars were in use in Europe by 1930. The inscription on this example reads "WILD HEERBRUGG SWITZERLAND No. 86845."
label: Description
content: Ref: Wild Heerbrugg, <i>Wild GBL 2m Subtense Bar</i> (Heerbrugg, 1972).
label: Description
content: F. Ackerl, "Entfernungsmessungen mit der Wildschen Invar-Basislatte," <i>Zeitschrift für Instrumentenkunde</i> 9 (1932): 393-400.
label: Location
content: Currently not on view
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: Zeitschrift für Instrumentenkunde
label: Related Publication
content: Wild Heerbrugg. Wild GBL 2m Subtense Bar
creditLine: label: Credit Line
content: Richard C. Naegele
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1996.0186.02
label: accession number
content: 1996.0186
label: catalog number
content: 1996.0186.02
objectType: label: Object Name
content: subtense bar
physicalDescription: label: Measurements
content: overall: 2 m; 6 9/16 ft