Pickett Computer Aerial Photographic Data Type A-1 (Mil-C-4318A)

Description

US Air Force Aerial Photographic Data Type A-1 Slide Rule (Model 520 - ten inch) MIL-C-4318A with Metric Scale
The Aerial Slide Rule was designed by Amrom H. Katz as a duplex, double-purpose rule with a series of scales on the front face for solving problems in vertical aerial photography as well as a series of scales on the back face for solving general problems common on a standard slide rule.
This rule was originally designed for the Photo Interpreter and others who must interpret measurements made on aerial photographs. In its current form, it is invaluable to photo pilots, navigators, photo officers, and others who were concerned with planning and executing missions or using aerial photographs.
This scale is important because it carries a series of scales of special scale marks which, when related to the altitude scale, give three or more measurements with one setting of the focal length and altitude scales.
FSN: 6760-597-2581
Mfg Part No: FAA-164M
Felsenthal Instruments Company
Mfg Code 22040
You can actually download the USAF Technical Manual No: M520-700 (published in 1951 by US Air Materiel Command) with full operating instructions for both this Model 520, Type A-1 and the Model 700, Type A-2 (6-inch) slide rule computers from:
https://www.sliderulemuseum.com/Manuals/M184_P232_Pickett_USAF_AerialPhoto_M520-700.pdf
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