I was able to find this in Model Engineer Magazine from 1986 but it is older than that as I had that tee before 1984.
The nut is called a Penrose hexigon named after the mathematician Roger Penrose in the 1950s. The bracket is also by Penrose. The earliest reference of the support I could find was from the June 1964 issue of Analog Science Fiction and Fact but I have a feeling it is older than that.
Working The Red Shift 2XL
Working The Red Shift 2XL
Working The Red Shift 2XL
(sorry for the double post)
Working The Red Shift
Working The Red Shift 2XL
The nut is called a Penrose hexigon named after the mathematician Roger Penrose in the 1950s. The bracket is also by Penrose. The earliest reference of the support I could find was from the June 1964 issue of Analog Science Fiction and Fact but I have a feeling it is older than that.
Working The Red Shift XXL
Working The Red Shift XXL