50 Years of Human Engineering

Subjects in Zero gravity in an aircraft - Test subjects floating in zero gravity in an aircraft in a flight path that produces zero gravity. These flights were designed to test the effects of weightlessness on the crew members of the future  vehicles in orbit around the earth. These tests, conducted by the Human Engineering Branch, were later continued and extended by NASA.

50 Years of Human Engineering, History and Cumulative Bibliography of the Fitts Human Engineering Division, 1945-1995 published by the Air Force Materiel Command, Wright-Patterson Air Force Base, Ohio, through the Government Printing Office, 1995.

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