Mechanical Computation.- Grant (George B.) "On a New Difference Engine", in The American Journal of Science and Arts, third series, vol. 2, pp. 113-117, New Haven, 1871; and "A New Calcuating Machine"

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Mechanical Computation.- Grant (George B.) "On a New Difference Engine", in The American Journal of Science and Arts, third series, vol. 2, pp. 113-117, lacking backstrip, title detached with upper cover, lower cover detached, 1871; "A New Calculating Machine", in The American Journal of Science and Art, third series, vol. 8, pp.277-284, 1874, ex-library copies with ink stamps, contemporary half calf, library paper labels, upper covers detached, tape repairs to covers, worn, New Haven, 8vo (2) *** Origins of mechanical computing in the United States. The first mentioned articles proposes a simpler and more economical difference engine, based on a mechanism using gear wheels arranges in successive orders. The second mentioned paper is a continuation and expansion of this earlier work, presenting a new calculating machine, distinct from the difference engine, designed for more general operations. In Charles Babbage's exploration, he had designed the difference engine and the analytical engine to automate the computation of astronomical and navigational tables. However, these machines were complex and expensive, with most never completed.

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