The compressive strength of duralumin columns of equal angle section
A 1932 NASA technical report on the compressive strength of duralumin (aluminium alloy) columns with equal-angle cross-sections, prepared for aeronautical engineers and structural researchers. Its pictures are dense technical graphs: families of labelled stress-versus-slenderness curves with dashed Euler curves, and stress-strain diagrams with yield points, all in black line on grid paper, offering a designer a clean, rigorous graph vocabulary for data-driven layouts.
