Remarks on airplane struts and girders under compressive and bending stresses : index values
A 1929 NACA technical memorandum from the NASA Technical Reports Server, written for aeronautical engineers, collecting remarks on the compressive and bending strength of airplane struts and girders. The first page is a set of geometric construction diagrams labelled Figs. 7, 8 and 9, and the second is a graph of stress against slenderness with Euler curves and a small open-section strut cross-section. A designer might take from them the plain line-drawn style of technical figures and the curved stress-curve graph as a clean chart format.
