Speed and pressure recording in three-dimensional flow
A 1932 NASA technical report on measuring speed and pressure in three-dimensional fluid flow, issued as a research paper for aerodynamics engineers and test-rig researchers. The pictures are engineering graphs and diagrams: a calibration curve on a log scale, paired curves of coefficients against angle, a plot of velocity and pressure across a runner test station, and streamlines flowing around a sphere. A designer could take from them the clean line-graph and streamline styling of early technical drawing, with labelled axes and fine dashed curves.
