On the stability of oscillations of an airplane wing
This is a 1923 technical report from the NASA Technical Reports Server, a set of aeronautical engineering papers on the stability of wing oscillations, written for aerodynamics researchers. Its pictures are line drawings: a perspective sketch of a wing section with axes and angle labels, a schematic of a wing beside a vertical plane, a side-view apparatus figure with dimensioned parts, and a graph of alpha and beta oscillation traces over time. A designer might take their clean technical line style, labelled axis diagrams and measured wave curves as reference for schematic or instructional graphics.
