Later in the 17th
century, Gottfried Wilhelm von Leibniz, a famous mathematician who invented
calculus and discovered the binary number system used by all computers today, invented a device that was supposed to be able to add, subtract,
multiply, divide and extract square roots. His device, the stepped reckoner,
included a cylindrical wheel called the Leibniz wheel and a moveable carriage
that was used to enter the number of digits in the multiplicand. It also
held great promise, but it did not work because of mechanically unreliable
parts that tended to jam and malfunction.
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