Arithmaurel
Mechanical calculator / From Wikipedia, the free encyclopedia
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The Arithmaurel was a mechanical calculator that had a very intuitive user interface, especially for multiplying and dividing numbers because the result was displayed as soon as the operands were entered. It was first patented in France by Timoleon Maurel, in 1842.[1] It received a gold medal at the French national show in Paris in 1849.[2] Its complexity and the fragility of its design prevented it from being manufactured.[3]
Its name came from the concatenation of Arithmometer, the machine that inspired its design and of Maurel, the name of its inventor. The heart of the machine uses one Leibniz stepped cylinder driven by a set of differential gears.[4]