Danny
Was it related to this monstrosity in ATC at RAF Thornhill (5 FTS) in 1952?
It supposedly showed the controller where aircraft were on the ground and in the circuit by plugging in pins which illuminated sections of the board accordingly - in dispersal, taxiing, awaiting take-off, airborne, downwind etc. etc.
It hardly ever worked and was more confusing than helpful; I learnt more swear words from the duty controller operating it than I ever did from the fruitiest drill sergeant on the parade ground.
