A view from 1944 of the NACA's Airplane Engine Research Laboratory (AERL) Icing Research Tunnel.
A view from 1944 of the NACA’s Airplane Engine Research Laboratory (AERL) Icing Research Tunnel. The Altitude Tunnel is in the center background, the propeller motor drive housing in the right background, and the Air Dryer and Cooling Tower in the left background.Image Credit: NACA