![]() ![]() (Mark Sense could not provide the current needed to âpickâ a wire contact relay and so needed vacuum tubes to amplify the current). A Control Panel (plug-board) controlled what function was to be performed by directing the impulse to a series of âwire contact relaysâ with the impulses de-coded according to the Hollerith code. ![]() #The punched card acted as an insulator and the electrical circuit was only completed in the presents of a punched hole. #The punch card was fed from the card hopper and read by means of an electrical voltage placed onto a metal âContact Rollâ, timing controlled by a âMaster Circuit Breaker, and 80 âRead Brushesâ, one brush for each card column, and âWire Contact Relaysâ which decoded the data.
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