Aerodynamic computation of gliders
A 1922 technical report on glider aerodynamics, issued by NASA's Technical Reports Server as a scanned archival document for engineers and students. Its pictures are plain line graphs and diagrams: force vectors on a wing, lift and drag coefficient curves plotted against angle of attack, and airfoil section profiles drawn in black ink on white. A designer could take the clean technical grid layout, the thin curved plot lines, and the labelled vector arrows as a restrained model for scientific diagrams.
