Impact tests on rubber compression springs for airplane landing gears
A 1930 NASA technical report on impact tests of rubber compression springs for airplane landing gears, issued as an engineering study of shock absorption. Its pictures are plain black-and-white engineering graphs and diagrams: load-against-deflection curves in kilograms and percent, a time-displacement curve, a time-factor plot with scattered data points, and a shaded triangular force diagram, all drawn with thin ink lines on white paper, which a designer could use as sparse technical line art or as a source of graph-paper and axis-label typography.
