Ground-Handling Forces on a 1/40-scale Model of the U. S. Airship "Akron."
A 1937 NASA technical report on ground-handling forces measured on a 1/40-scale model of the U.S. airship Akron, presenting wind-tunnel data for engineers studying aerodynamic loads. The single picture is a dense scientific graph plotting lift, longitudinal-force and cross-force coefficients against Reynolds number for several model heights above a ground board, with scattered data points and fitted curves in black and white. A designer could take from it the plain engineering chart conventions of labelled axes, marker symbols and legend boxes.
