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NACA Flight-Path Angle and Air-Speed Recorder (1926)
NASA Technical Reports Server (NTRS) · leaf 15
Fig.10 Calibration of inclinometer. Flight-path-angle and air-speed recorder, inst ru::ient 1 fo . 148 .NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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