The Design of Airplane-engine Superchargers
A 1937 NASA technical report on designing supercharger compressors for aircraft piston engines, issued for aeronautical engineers and researchers. Its pictures are dense engineering charts of altitude performance curves, compressor characteristic plots and graphs with labelled axes, grid lines and dashed families of curves, giving a designer a sense of how technical data was visualised in the period and suggesting graph layouts for a minimal, schematic look.
