Practical Tests with the "auto Control Slot." Part I : Lecture
This is a 1930 aeronautical lecture from the NASA Technical Reports Server on practical wind-tunnel tests of a slotted aerofoil, presented as a technical report for engineers and researchers. The pictures are line graphs of lift and drag coefficients against angle of attack, a slot-geometry diagram, and plotted curves with angle labels, all in plain black line work that suggests scientific charts rather than decoration. A designer might draw on their clean, schematic linework, radiating angle fans, and grid-based plotting for a minimalist technical graphic.
