Felsenthal CPU-73 A/P Air Navigation Attack Computer

Front of the CPU-73AP air navigation computer

The Felsenthal CPU-73 A/P Air Navigation Attack Computer is a special purpose circular slide rule made for the United States Air Force andmanufactured by the Felsenthal Instrument Corporation. Designed to calculate the course required for a fighter pilot to intercept a moving target, it is 9 inches in diameter.[1]

During World War II, Felsenthal produced over 75% of the plastic calculating instruments used by the Army Air Forces, and over 90% of those used by the Navy Bureau of Aeronautics. After the war, it introduced a variety of plastic items for commercial and technical purposes. Located in Chicago, it was known as G. Felsenthal & Sons in the 1940s, G. Felsenthal & Sons, Inc. in the 1950s, Felsenthal Plastics Inc. in 1971, and Felsenthal Instrument Co. in 1972.[2]

References

  1. ↑ https://www.worthpoint.com/worthopedia/usaf-air-navigation-circular-slide-511722500
  2. ↑ http://amhistory.si.edu/navigation/maker.cfm?makerid=173
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