A theoretical study of the moment on a body in a compressible fluid
A NASA technical report from 1939 on the moment acting on a body in compressible fluid flow, written for aeronautical researchers and engineers. The four pictures are mathematical diagrams: a source and circle in the complex plane, a Joukowski airfoil transformed into a circle, contour tangent and normal directions, and conformal transformation between z-planes. A designer might take their clean line-diagram style, with labelled axes, arrows and dimension marks, as a reference for technical schematic layouts.
