Measurements of Intensity and Scale of Wind-Tunnel Turbulence and Their Relation to the Critical Reynolds Number of Spheres
This is a 1937 NASA technical report on wind-tunnel turbulence measurement, issued as a government aeronautics research document for engineers and aerodynamics researchers. The first picture is a line diagram of the wind tunnel throat showing screen positions and dimensions in a plain technical drawing style, while the second is a black-and-white photograph of a traversing apparatus on a tall stand with a round cast base, giving a designer clean, utilitarian linework and a stark industrial object to draw from.
