The Enlarged N.A.C.A. Tank, and Some of Its Work
A 1939 NACA technical report describing the enlarged towing tank and its experimental work, issued by the US National Advisory Committee for Aeronautics for engineers and researchers in hydrodynamics. The pictures are engineering line drawings: a towing-carriage apparatus with cable pulleys and linkages, a side elevation of a carriage frame with wheels, a hull section marked with a waterline, and a graph of speed against motion with plotted curves. A designer could take their clean, technical diagram style, labelled callouts, and restrained monochrome linework.
