An Automatic Speed Control for Wind Tunnels
This is a 1928 technical report from the National Advisory Committee for Aeronautics, issued through NASA's Technical Reports Server, describing an automatic speed control for wind tunnels aimed at aeronautical engineers and researchers. Its pictures are black-and-white photographs and line drawings of instruments such as manometers, pitot-static tubes, pressure gauges and a wind-force recording apparatus, with clean schematic plates a designer could use for mechanical and laboratory equipment reference.
