Air Flow in the Boundary Layer of an Elliptic Cylinder
This is a 1939 NASA technical report on airflow in the boundary layer around an elliptic cylinder, written for aerodynamics researchers and engineers. The first picture is a photograph of a hot-wire anemometer and traversing equipment with labelled parts, and the second is a set of three striated smoke or flow photographs marked with distance from the leading edge and speed values. A designer might take from them the look of fine parallel streaks and instrument rig detail as technical texture.
