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In the 1880s, Princeton Professor Allan Marquand (1853-1924) devised a machine to solve problems by formal logic. Constructed from the wood of a red cedar post from Princeton's oldest homestead, the machine displayed all the valid implications of a simple logical proposition by using an arrangement of rods and levers, catgut strings and spiral springs. Marquand later diagrammed an electrical circuit for his machine -- the first known design for an electric logic machine.
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