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Jacob Leupold (1674-1727) was a German mechanician and mining commissioner who published an important and popular book on machine technology in 1727. A plan for a calculator designed to incorporate a Leibniz-type stepped drum in a circular system was included in this work. Leupold proposed varying the number of teeth which engaged with the counter at each turn and then disengaging the gear wheel when the required number of teeth had meshed with the counter. His machine - of which this is a replica - was never built. |
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