Motion of fluids with very little viscosity
This is a 1928 NACA technical memorandum on fluid mechanics, issued by the National Advisory Committee for Aeronautics for aeronautical researchers and engineers. Its pages carry numbered technical figures of streamline patterns: flow contours around a circular cylinder, a boundary-layer velocity profile curve, and a boundary-layer velocity diagram. A designer could take from them the clean, precise linework of engineering diagrams, with flowing parallel contour lines that suggest motion and wake eddies.
