Object is a wooden cabinet on castors with a folding side extension. A door on one side opens to give access to the interior where there are cables and a large panel with four terminal strips and two gangs of toggle switches. There is an access door at the back. At the upper back is a strip of metal with seven pilot lights where all the lenses are missing, and two push-buttons, one red and one black. The wiring and the finishing of metal panels are strongly reminiscent of Whirlwind. There is a small white paper tag on the wiring which reads "4/9/56 OK ACA".