General Theory of the Steady Motion of an Airplane
A 1921 aeronautical engineering text published by NASA's Technical Reports Server, presenting the mathematical theory of steady airplane flight for engineers and aerodynamicists. Its pictures are dense technical diagrams: a large performance chart with curves and grids, graphs of thrust and speed curves in quadrants, and streamline and wind-structure plots with vortex-like closed loops. A designer might take from them the clean, rigorous linework of early engineering graphics and the rhythm of nested curves and flowing contour lines.
