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First patented in France by Timoleon Maurel, in 1842, 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 received a gold medal at the French national show in Paris in 1849.〔(fr) (''Rapport du jury central sur les produits de l'agriculture et de l'industrie exposés en 1849'', Tome II, page 542 - 548, Imprimerie Nationale, 1850 ) Gallica〕 Unfortunately its complexity and the fragility of its design prevented it from being manufactured.〔(fr) (Le calcul simplifié ) Maurice d'Ocagne, page 269, Bibliothèque numérique du CNAM〕 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.〔(fr) Philbert Maurice d'Ocagne (fr), ''Le Calcul Simplifié'', Gauthier-Villars et Fils, 1894, page 29〕 ==History== Timoleon Maurel patented an early version of his machine in 1842,〔(fr)(1842 patent ) - Document scanned by www.ami19.org〕 he then improved its design with the help of Jean Jayet and patented it in 1846.〔(fr) (patent held by Maurel and Jayet 1846 ) - Document scanned par www.ami19.org〕 This is the design that won a gold medal at the ''Exposition nationale de Paris'' in 1849. Winnerl, a French clockmaker, was asked to manufacture the device in 1850, but only thirty machines were built because the machine was too complex for the manufacturing capabilities of the time.〔(fr) Jean Marguin, ''Histoire des instruments et machines à calculer'', Hermann, 1994, page 130〕 During the first four years, Winnerl was not able to build any of the 8 digit machines (a minimum for any professional usage) that had been ordered while Thomas de Colmar delivered, during the same period, two hundred 10 digit Arithmometers and fifty 16 digit ones.〔(fr) (Cosmos, Janvier 1854, page 77 ) Document scanned by Valéry Monnier〕 It is to be noted that none of the machines that were built and none of the machines described in the patents could be used at full capacity because the capacity of the result display register was equal to the capacity of the operand register (for a multiplication, the capacity of the result register should be equal to the capacity of the operand register augmented by the capacity of the operator register). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arithmaurel」の詳細全文を読む スポンサード リンク
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