e calculator due to the design of French currency at the time. There were 12 deniers in a sol, and 20 sols in a livre. Therefore there were 240 deniers in a livre. Hence Pascal had to deal with more technical problems to work with this odd way of dividing by 240. Yet the currency system remained the same in France until 1799, but Britain's similar system lasted until 1971. Production of the Pascaline began in 1642. It was recorded by Adamson that:
             "By 1652 fifty prototypes had been produced, but few machines were sold, and manufacturing of Pascal's arithmetical calculator ceased in that year."
             In 1646 Etienne Pascal injured his leg and had to recuperate in his house. Two young brothers from a religious movement outside of Rouen came to help take care of him
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