The Torsion of Members Having Sections Common in Aircraft Construction
A 1930 aeronautical engineering report from the NASA Technical Reports Server, written for aircraft structure engineers and compiled from research on how structural members twist under load. The pictures show laboratory torsion apparatus and test specimens, with photographs of a rig holding a twisted member and a distorted section marked with a grid of lines to show warping, a plain record of experimental engineering practice that a designer could use for sketches of mechanical test equipment and gridded deformation studies.
