The Twisting of Thin-walled, Stiffened Circular Cylinders
This is a 1938 NACA Technical Memorandum (No. 878) issued by the National Advisory Committee for Aeronautics, reporting torsion tests on thin-walled stiffened circular cylinders for aircraft structure engineers. The pages mix engineering cross-section drawings, test specimen sketches, load-deflection graphs and wrinkle-profile wave plots drawn in fine black line on cream paper. A designer might draw on the clean diagrammatic style, the repeated ring-and-stringer geometry and the sinusoidal wave curves as graphic motifs.
