Effect of aileron displacement on wing characteristics
A NACA technical note from 1933 by the National Advisory Committee for Aeronautics, issued as an engineering report on how aileron displacement changes wing behaviour, written for aircraft researchers and designers. Its pictures are plain line diagrams of a Clark Y airfoil with deflected aileron vectors, plus one graph of drag coefficient against aileron angle, drawn in thin black lines on white paper with labelled angles and captions. A designer might take from them the clean schematic style of technical diagrams, with dashed and solid line plotting and simple labelled callouts for showing angle and direction.
