Some problems on the lift and rolling moment of airplane wings
A 1925 NASA technical report on aerodynamic problems of airplane wing lift and rolling moment, written for aeronautical engineers and researchers. Its single picture is a grid of small graphs plotting wing loading curves against span position, with a horizontal axis marked on each panel and a dashed centre line, labelled (a) through (h) in two columns. A designer could take from it the clean, minimal style of technical line graphs, with thin black curves on white and a tidy modular layout.
