Collection Item Summary:
U.S. Air Force photo interpreters used the precision viewers and measuring instruments contained in this type of kit to study aerial photographs. Several items from the kit are displayed here. The reverse side of a standard slide rule. Aerial Photographic Computer, Type A-1
This updated version of the Type A-1 computer, first developed by Amron Katz, has special scales for aerial photography. It is placed on the reverse side of a standard slide rule.
10-Inch Proportional Divider
The divider measures proportions from 2:1 to 10:1.
6-Inch, 11-Point Divider
This proportional divider is designed so the tiny points do not cover any pertinent areas of the photo.
2 and 4 Magnification Stereoscopes
A stereoscope allows an interpreter to view photos as three-dimensional images.