N.A.C.A. Stall-Warning Device
This is a 1938 NACA technical report on a stall-warning device for aircraft, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers. Its pictures are line drawings and a photograph of a pressure-head probe on a wing leading edge, with a test-data graph of indicator reading against speed, showing how a designer might picture sensor placement and aerodynamic instrumentation.
