Tetrahedral drilling machine for miniature ball-and-spoke models developed by CA Beevers, Edinburgh, in use 1970-1978, with acrylic balls suitable for drilling Tetrahedral Drilling Machine, 1970
Cathode assembly of X-ray tube made in 1934 and used by C.A. Beevers and H. Lipson in work on the structure of copper sulphate and the alums. Cathode assembly of X-ray tube