Effect of periodic changes of angle of attack on behavior of airfoils
A 1922 aeronautical research report by Richard Katzmayr, issued in English translation as a National Advisory Committee for Aeronautics technical note for engineers studying wing behavior in oscillating airflow. The plates are hand-drawn wind-tunnel graphs: dashed grids, lift and drag coefficient curves traced through clusters of dot, cross, circle and triangle data points, with hand-lettered axis labels and small symbol keys that suit diagrammatic collage, chart ornament and technical texture.
