NACA Flight-Path Angle and Air-Speed Recorder
This NACA technical report from 1926, issued by the National Advisory Committee for Aeronautics, documents an instrument that recorded an aircraft's flight-path angle and air speed for engineers and aviation researchers. Its plates show calibration graphs, capsule assembly drawings and photographs, and a cutaway diagram of the recorder fitted into an aircraft body, which a designer could use for clear technical line diagrams and graph layouts.
