The Scale Effect in Towing Tests with Airplane-float Systems
This is a 1937 NACA technical memorandum, a government aeronautical research report issued by the National Advisory Committee for Aeronautics for engineers and researchers studying seaplane and airplane-float hydrodynamics. The pictures are dense engineering charts: multi-panel line graphs with grid axes, sets of curves plotted against a numbered scale, and a plotted diagram of roughness and friction values. A designer could take from them the clean, restrained vocabulary of mid-century technical graphics, with gridded plots, labelled keys, and tightly packed small multiples on plain paper.
