4X10 INCH TUNNEL AND 3.4 INCH TUNNEL AND THE ALTITUDE WIND TUNNEL AWT DUCT LAB
A small supersonic wind tunnel with a 4-by 10-inch test section was built under the Altitude Wind Tunnel (AWT)'s Shop and Office Building in 1945 (4/21/1948).
Image Credit: NASA
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https://www.nasa.gov/image-detail/grc-1948-c-21291/
Image CreditNASA
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