Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer

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.

Boeing Aviation Hangar
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.