trimetrogon


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trimetrogon

A fan camera arrangement for production of maps and charts. Three cameras with wide-angle lenses are mounted together to give lateral coverage from horizon to horizon. The center camera is used for vertical photography and the outer two cameras for oblique photography. A trimetrogon installation is shown in the illustration.
References in periodicals archive ?
This began to change in 1946/47 when the American 'Operation Highjump' expedition undertook trimetrogon photography from naval aircraft over more than half the unknown coastline.
Cette couverture par prise de vue oblique (trimetrogon) a ete achevee par l'Aviation royale du Canada au debut des annees 1950 et celle par photographie verticale a ete terminee a la fin des annees 1950.
Army Air Force's trimetrogon survey of the High Arctic (Fig.
Trimetrogon photography was repeated by the Royal Canadian Air Force in 1950 and 1952 (Fig.
The Visual and Sound Archives (VSA), National Archives of Canada, hold a collection of some 200 000 trimetrogon aerial photographic prints (not negatives) of various parts of Canada taken between 1931 and 1948 by the U.S.