The torsional stiffness of thin duralumin shells subjected to large torques
This is a 1934 NACA technical report by the NASA Technical Reports Server collection on the torsional stiffness of thin duralumin aircraft shells under large torques, written for aeronautical engineers and researchers. The pictures are plain engineering graphs with black ink curves, scattered cross and circle data points on ruled grids, and small line diagrams of wing-like box sections with dimensioned bulkheads, ribs and skin thicknesses. A designer could take their strict monochrome grid layouts and labelled schematic cutaways as examples of technical chart style.
