APL demonstration 1975

1975 live demonstration of the computer language APL (A Programming Language) by Professor Bob Spence, Imperial College London. Bob joined the staff of Imperial College in the 1962 and is now Professor Emeritus in EEED. His field of work has ranged from engineering design, to humancomputer interaction (HCI) and along the way is credited with the invention of the first focus+context technique, the Bifocal Display (aka Fisheye lens) featured in another video. For