A Leibniz wheel or stepped drum was a cylinder with a set of teeth of incremental length which, when coupled to a counting wheel, was used in the calculating engine of a class of mechanical calculators. Invented by Leibniz in 1673, it was used for three centuries until the advent of the electronic calculator in the mid 1970s. Leibniz built a machine called the Stepped Reckoner based on that design in 1694.
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- A Leibniz wheel or stepped drum was a cylinder with a set of teeth of incremental length which, when coupled to a counting wheel, was used in the calculating engine of a class of mechanical calculators. Invented by Leibniz in 1673, it was used for three centuries until the advent of the electronic calculator in the mid 1970s. Leibniz built a machine called the Stepped Reckoner based on that design in 1694. It was made famous by Thomas de Colmar when he used it, a century and a half later, in his Arithmometer, the first mass produced calculating machine. It was also used in the Curta calculator, a very popular portable calculator introduced in the second part of the 20th century.
- Fichier:Cylindre de Leibniz animé. gif Cylindre de Leibniz Un cylindre cannelé de Leibniz est un cylindre dont les dents sont de longueurs inégales et qui fut utilisé pendant trois siècles dans les organes de calcul d'une classe de machine à calculer. Il fut inventé par l'allemand Gottfried Wilhelm Leibniz en 1671. Leibniz construisit la première machine à calculer qui utilisait ce cylindre en 1694, mais c'est Thomas de Colmar qui le rendit célèbre quand il l'incorpora dans son arithmomètre qui fut la première machine à calculer commercialisée. Il fut aussi utilisé dans la Curta, une machine à calculer portable construite de 1948 à 1972.
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- A Leibniz wheel or stepped drum was a cylinder with a set of teeth of incremental length which, when coupled to a counting wheel, was used in the calculating engine of a class of mechanical calculators. Invented by Leibniz in 1673, it was used for three centuries until the advent of the electronic calculator in the mid 1970s. Leibniz built a machine called the Stepped Reckoner based on that design in 1694.
- Fichier:Cylindre de Leibniz animé. gif Cylindre de Leibniz Un cylindre cannelé de Leibniz est un cylindre dont les dents sont de longueurs inégales et qui fut utilisé pendant trois siècles dans les organes de calcul d'une classe de machine à calculer. Il fut inventé par l'allemand Gottfried Wilhelm Leibniz en 1671.
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- Cylindre cannelé de Leibniz
- Leibniz wheel
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