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.
Display Status
This object is on display in Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.
Object Details
Country of Origin
United States of America
Type
EQUIPMENT-Photographic
Manufacturer
G. Felsenthal & Sons Inc.
Physical Description
Kit contains 17 items, see accession worksheets.
Inventory Number
A19771915000
Credit Line
Gift of Ben W. Rau
Data Source
National Air and Space Museum
Restrictions & Rights
Usage conditions apply
For more information, visit the Smithsonians Terms of Use.