1937-Model K

Model KGeorge Stibitz completes a relay-based computer to calculate using binary addition whilst working at Bell Labs. Using two telephone relays, two flashlight bulbs and a wire and a dry cell from the Bell stockroom, and a switch made from a tobacco tin, Stibitz makes a device that was the first relay-based binary adder. Model K is named by Stibitz’s wife after the “kitchen table” and is taken to work the following day to show to his colleagues, who speculate that the volume and size of relays that would be required to create a full sized calculator would be bulkier, and more expensive, than the mechanical calculators that they currently had at Bell. Labs.


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