On the actual loads on airplane landing gears
This NACA technical memorandum from 1937, issued by NASA's Technical Reports Server collection, reports measured landing-gear loads on airplanes for aeronautical engineers. Its pictures are plain line graphs of vertical and horizontal forces plotted against time in seconds, with dotted and solid traces, open circle markers and small schematic diagrams of a landing wheel; a designer might borrow their minimal chart styling, thin rules and clean axis labelling.
