Replica of Pascal's calculator

Pascal's calculating machine, 1642.
Replica made by E. Rognon, Paris of Blaise Pascal's first calculating machine of 1642, held by the Conservatoire National de Art et Metiers, Paris.The original machine was completed in 1642 when Pascal was only 19, to help his father in business. It was designed for addition and subtraction using a stylus to move the number wheels. Although it became well-known it could not be mass produced.
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