Wind-tunnel tests of a Clark Y wing with a narrow auxiliary airfoil in different positions
This NACA-style aerodynamics report from 1933, issued through the NASA Technical Reports Server, records wind-tunnel measurements on a Clark Y wing fitted with a narrow auxiliary airfoil at several positions. Its three pictures are line graphs plotting lift coefficient, drag coefficient, and centre of pressure against angle of attack in degrees, with curves for each flap or slot setting. A designer could take from them the plain grid-and-curve chart style with labelled axes and dashed multi-series legends.
