1956 NACA wind tunnel wall jacks. Original caption: "FLEXIBLE WALL JACKS FOR THE 10X10 FOOT WIND TUNNEL".
Fullsize image: https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...wall_jacks.jpg
Previously:
https://www.homemadetools.net/forum/...162#post153717
https://www.homemadetools.net/forum/...802#post171104
https://www.homemadetools.net/forum/...767#post170965
