Interference Tests on NACA Pitot Tubes
This is a 1925 National Advisory Committee for Aeronautics technical report, published in the United States, that tested how the bodies of aircraft and their struts disturb pitot tubes used to measure airspeed, written for engineers and aviation researchers. The pictures are black-and-white photographs of wind-tunnel test rigs and a few plotted graphs: a streamlined body on a rod, a curve of percentage of true head against distance, a log-scale calibration chart, and a wide view of the test setup. A designer could take from them the clean, technical look of early aeronautical measurement, with its sparse grid plots and grainy tunnel photography.
