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Mechanical Counting

Mechanical Counting

grabcad

Mechanical Counting Devices - Abacus, Napier's Bones, Slide Rule. The abacus was one of the first adding machines. The abacus is made out of beads strung by several wires. The position of a bead determines its value. ... He also created a device using rods, called Napier's bones, to perform arithmetical calculations.

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