NACA 11-foot valve installation, c. 1955. Full caption "11 FOOT DIAMETER VALVE AT VARIOUS POSITIONS FOR ALTITUDE EXHAUST LINE IN REAR OF PROPULSION SYSTEMS LABORATORY PSL EQUIPMENT BUILDING - THIS VALVE MANUFACTURED BY W S ROCKWELL COMPANY"
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
Previously:
1956 NACA metallurgical services worker - photo
1956 NACA wind tunnel wall jacks - photo
1952 NACA heat transfer test section and rig - photo
1956 NACA magnaflux inspection - photo
1951 NACA 20-inch compressor in lathe - photo
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