The Effects of Shielding the Tips of Airfoils
This is a 1925 NASA technical report, issued through the NASA Technical Reports Server, on how end-plates and washout change airfoil tip performance. Its pictures are engineering graphs of lift and drag coefficients against angle of attack and aspect ratio, plotted as thin black curves on gridded paper with labelled data points. A designer might take from them the clean, sparse plotting style, with curves in varied line weights and captioned legends, as a model for technical data graphics.
