Of current interest: Power compressors provide continuous operation in hypersonic wind tunnel

Speeds of more than ten times the velocity of sound are being obtained in the recently completed hypersonic wind tunnel on the campus at the California Institute of tecnology, Pasadena, Paul, rowered principally by (General Electric motors, the tunnel was designed and built for the Institute and the Army Ordnance Department to provide vitally needed information for use in the design of future missiles at speeds well above those of present-day rockets and missiles.