Recent researches on the air resistance of spheres
A 1928 aeronautical research report from the NASA Technical Reports Server, compiling experimental measurements of air drag on spheres across Reynolds numbers, written for engineers and aerodynamicists. The pictures are plain line graphs with labelled curves plotting drag coefficient against Reynolds number, with dashed and solid traces, lettered points, and grid lines; a designer might take their restrained scientific chart style, clean hand-inked curves, and sparse grey-and-black palette as a model for technical diagrams.
