Moments of inertia of several airplanes
A 1931 NASA technical report on moments of inertia of several airplanes, compiled from the NASA Technical Reports Server for aeronautical engineers. The single picture is a technical diagram of an ellipse of inertia with labelled X and principal axes, dimension markings and a figure caption. Its clean geometric linework suggests a designer could borrow the precise schematic style of mid-century engineering diagrams for technical overlays or minimal line graphics.
