Analysis of the three lowest bending frequencies of a rotating propeller
A 1936 NASA technical report on the three lowest bending frequencies of a rotating propeller, issued as an aeronautical engineering analysis for specialist engineers. The pictures are dense technical line charts plotting oscillation frequency ratios against propeller revolutions and frequency, with stepped curves, labelled fan-like families of rays, and a schematic of the three analysis approaches; a designer might take the restrained grid-and-curve visual language and the radiating line structure as a model for graphs or data diagrams.
