Investigations and Experiments in the Guidonia Wind Tunnel
This is a 1939 NACA technical memorandum, No. 901, issued by the National Advisory Committee for Aeronautics and preserved through the NASA Technical Reports Server, reporting wind tunnel experiments at the Guidonia facility near Rome. Its plates are photographs of schlieren-style shadowgraph views of airflow around a slender test body, paired with plotted graphs of strength, pressure and drag coefficients. A designer could draw on the soft radial glow, the sharp dark probe shadow and the clean grid charts as graphic motifs for technical diagrams.
