The variation of aerofoil lift and drag coefficients with changes in size and speed
This is a 1923 technical report from NASA's Technical Reports Server, a scientific paper on how aerofoil lift and drag coefficients change with size and speed, written for aeronautical engineers. Its single picture is a plotted graph rather than an illustration: curves of lift coefficient against velocity-related values for angles of attack from -2 to 14 degrees, with dense grid lines. A designer might take from it the clean, labelled line-graph style of early engineering data charts.
