The comparative performance of superchargers
A 1932 NASA technical report on superchargers, compiled for aeronautical engineers and researchers, comparing supercharger performance across altitudes. The four pictures are engineering charts: a brake horsepower versus standard altitude family of curves, a compression exponent nomogram with absolute temperature scales, a polytropic and constant-pressure curve chart, and a small horsepower-against-altitude plot with stepped critical-altitude curves. A designer might borrow their dense grid-and-curve structure, labelled scales, and fine line-work for technical diagram or data-visualisation layouts.
