Similitude in hydrodynamic tests involving planing
A 1936 NASA technical memorandum on similitude in hydrodynamic tests of planing hulls, issued as a plain engineering report for aeronautical and marine researchers. Its two pictures are line graphs of resistance against speed, with families of curves plotted on gridded paper in black ink and dashed or solid line styles. A designer might take from them the look of dense technical charts, with multiple overlapping curves, tick-marked axes, and labelled legends for scaled model sizes.
