Generalized analysis of experimental observations in problems of elastic stability
This is a 1938 NASA technical report, a generalized analysis of experimental observations in elastic stability problems, presumably written for engineers and researchers in structural mechanics. Its two pictures are plain engineering diagrams: a straight-line graph of a normalized deflection ratio against deflection difference with a labelled intercept, and a schematic of a slender column bowed under end compression P, drawn with dashed reference line and a curved deflected shape. A designer might take from them the spare line-and-label vocabulary typical of mid-century technical drawing.
