Topoangulator, an Instrument for Photogammetry, with Manual for Trimetrogon

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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.
Currently not on view
date made
ca 1953
Theodore Alteneder and Sons
place made
United States: Pennsylvania, Philadelphia
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
ID Number
accession number
catalog number
Credit Line
Gift of University of Missouri - Columbia
Drafting, Engineering
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Single Drawing Instruments
Data Source
National Museum of American History


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