Cal Tech Wind Tunnel Prop - 1934

Vintage original press photo, 7x9", b&w.  Press release on reverse introduces the 14 ft, 11 in propeller attached to a 1000 H.P. motor driving the wind tunnel to 225 mph in the Guggenheim Aeronautical Lab, California Institute of Technology.  Date is 4/8/1934.  Very good, one small corner chip.