Remarks on the elastic axis of shell wings
This is a 1936 NASA technical report, presented as a remarks paper on the elastic axis of shell wings, likely written for aeronautical engineers and structural analysts. The pictures are line diagrams of aircraft wing cross-sections and spars showing flexural and torsional centers, bending under loads, and internal stiffening structures, which a designer could take as clear, schematic engineering drawings of how forces act on a wing.
