Choice of profile for the wings of an airplane. Part II
A 1928 NACA technical memorandum on airfoil profile selection, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and wing designers, and held in the NASA Technical Reports Server. Its pictures are dense engineering charts of lift and drag curves plotted on gridded paper beside a geometric construction of a circle with tangent lines and labelled points, rendered in plain black linework with no decoration, which a designer might take as a model for how technical plots and construction diagrams are laid out.
