Pascal's calculator is a mechanical calculator invented by Blaise Pascal in the early 17th century. It was called the arithmetic machine and later became known as the Pascaline. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as supervisor of taxes in Rouen. He designed the machine to add and subtract two numbers directly and to perform multiplication and division through repeated addition or subtraction.

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• Pascal's calculator is a mechanical calculator invented by Blaise Pascal in the early 17th century. It was called the arithmetic machine and later became known as the Pascaline. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as supervisor of taxes in Rouen. He designed the machine to add and subtract two numbers directly and to perform multiplication and division through repeated addition or subtraction. Pascal's calculator was especially successful in the design of its , which adds 1 to 9 on one dial, and when it changes from 9 to 0, carries 1 to the next dial. His innovation made each digit independent of the state of the others, which enabled multiple carries to rapidly cascade from one digit to another regardless of the machine's capacity. Pascal was also the first to shrink and adapt for his purpose a lantern gear, used in turret clocks and water wheels, which could resist the strength of any operator input with very little added friction. Nine Pascal calculators have been made, including from the 17th century. Most of them are on display in European museums, including a calculator which Pascal and Wilhelm Schickhard made in a collaboration in 1640. (en)
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• Pascaline made for French currency. The least significant denominations, sols and deniers, are on the right.
• View through the back of the above calculator, showing the wheels.
• Detail of the carry mechanism and of the sautoir
• Top view and overview of the entire mechanism
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• horizontal
• vertical
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• Source: Œuvres de Pascal in 5 volumes, La Haye, 1779
• This machine once belonged to Louis Perrier, Pascal's nephew
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• Pascaline - top view and mechanism.jpg
• Pascaline calculator front.png
• Pascaline calculator.jpg
• Detail of the pascaline's carry mecanism - the sautoir.jpg
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• Pascal's calculator is a mechanical calculator invented by Blaise Pascal in the early 17th century. It was called the arithmetic machine and later became known as the Pascaline. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as supervisor of taxes in Rouen. He designed the machine to add and subtract two numbers directly and to perform multiplication and division through repeated addition or subtraction. (en)
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• Pascal's calculator (en)
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