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Telephone-switching networks of [[relays|electromechanical relays]] were invented in 1835. These led to the invention of the digital adding device by [[George Stibitz]] in 1937. While working in Bell Laboratories, he observed the "burdensome" use of mechanical calculators with gears. "He went home one evening in 1937 intending to test his idea... When the tinkering was over, Stibitz had constructed a binary adding device".<ref>Melina Hill, Valley News Correspondent, ''A Tinkerer Gets a Place in History'', Valley News West Lebanon NH, Thursday, March 31, 1983, p. 13.</ref><ref>Davis 2000:14</ref>
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=== Formalization ===
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