Strength Tests on Thin-walled Duralumin Cylinders in Torsion
This is a 1932 NACA technical note, published by the National Advisory Committee for Aeronautics for engineers and aircraft researchers, reporting torsion strength tests on thin-walled duralumin cylinders. Its pictures are plain charts of buckling-wave counts against radius-to-thickness ratio, log-scale design curves, and photographs of test cylinders after failure, with diagonal buckle patterns visible on the metal surfaces. A designer could take from them the stark graphic language of engineering plots, with thin grid lines, labelled curves and sparse type, and the dramatic diagonal creasing of collapsed metal.
