Synopsis of aeronautic radiator investigations for years 1917 and 1918
A 1920 NACA-style technical synopsis of aeronautic radiator tests from 1917 and 1918, issued by the NASA Technical Reports Server collection for aircraft engineers. Its pictures are dense engineering graphs plotting energy dissipated, horsepower absorbed, and head resistance against mass airflow and free air speed, each with a small radiator core cross-section inset. A designer might take from them the restrained grid-and-curve vocabulary of early scientific charts, with thin black lines, labelled axes, and a single accent of plotted points.
