Topoangulator, an Instrument for Photogammetry, with Manual for Trimetrogon
date: label: date made
content: ca 1953
name: label: maker
content: Theodore Alteneder and Sons
notes: label: Description
content: During and after World War II, the U.S. armed forces took extensive photographs using a system of three cameras known as a trimetrogon camera. These cameras took one vertical and two oblique photographs simultaneously, for use in topographic mapping. Various instruments were used to reduce data from the photographs to useful form. According to the mark on the case, this instrument was a topoangulator, used to measure vertical angles in the principal plane of oblique photographs (particularly those taken by a trimetrogon camera). The instrument has a metal base with handles at each end and two sets of scales. A square metal plate is also included, as well as a 1953 manual relating to the measurement of trimetrogon photographs. The diagrams in the manual do not show this instrument.
label: Location
content: Currently not on view
place: label: place made
content: United States: Pennsylvania, Philadelphia
topic: label: Subject
content: Mathematics
label: Subject
content: Drafting, Engineering
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Single Drawing Instruments
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of University of Missouri - Columbia
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.333659
label: accession number
content: 300659
label: catalog number
content: 333659
objectType: label: Object Name
content: drawing instrument
physicalDescription: label: Measurements
content: overall: 5.8 cm x 66 cm x 35.7 cm; 2 9/32 in x 25 31/32 in x 14 1/16 in