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(505) 
BENCH CAMERA 
by 
Mylon Merriam, Photographic Technologist, Army Map Service. 
In order to demonstrate the diversity of photo-projections now possible, 
a number of photographs of a single terrain model were prepared at Army Map 
Service, Washington, D. C., especially for the Seventh Congress. Vertical and 
oblique photographs of terrain were shown in the central, parallel and inverse- 
  
Fig. 1. "Line of Sight Systems over Terrain" Display for Commission V. 
central perspective projections. The model and photographs were placed on 
display for Commission V, under the display title “Line of Sight Systems over 
Terrain.” The display booth is shown in Fig. 1. (As no illustrations were given 
as part of the oral presentation, several examples of photo-projections from the 
display are appended here, and reference included in the text). The descriptive 
method employed for organizing the display is indicated by the title, and the 
strings stretched across the photographs. The directions of headings, or lines of 
sight over terrain as they change from one projection to another, are shown by 
the direction of the strings. The method was chosen primarily to achieve a 
definition of possible mapping use of each of the photo-projections of terrain 
models. 
Photographs were all made on the bench camera at Army Map Service. 
The camera itself is quite large and will eventually use a 48 inch aperture 40 
foot radius spherical reflector as entrance window. The apparatus is called a 
bench camera because many optical bench methods are employed which usually 
are not associated with the function of the conventional photographic objective, 
39