Effect of Turbulence in Wind-Tunnel Measurements
This is a 1931 NASA technical report on how air turbulence affects wind-tunnel measurements, written by engineers for aeronautical researchers. Its pictures are plain engineering graphs of drag and Reynolds number curves, a sphere-drag scatter plot, and a valve amplifier circuit diagram. A designer might take from them the spare grid-and-curve vocabulary of early aerodynamic charts, with dashed and solid line variants and tick-marked axes.
