Keywords: naca nasa nasa glenn research center nasaglennresearchcenter 1956 blackandwhite monochrome black and white Description 24 foot diameter swinging valve at various stages of opening and closing in the 10ft x 10ft Supersonic Wind Tunnel at what is now the Glenn Research Center in Cleveland, OH. Image #: Date: May 17, 1956 Description 24 foot diameter swinging valve at various stages of opening and closing in the 10ft x 10ft Supersonic Wind Tunnel at what is now the Glenn Research Center in Cleveland, OH. Image #: Date: May 17, 1956 |