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Blaise Pascal (1623-1662), French mathematician, physicist, inventor and philosopher. At 19, Pascal invented a mechanical calculating machine based on cogs, also known as a pascaline (calculator). Pascal also made contributions to geometry and hydrostatics. He worked with French mathematician Fermat, founding probability theory. The SI unit of pressure, the Pascal, was named after him to honour his work on hydrostatics. Artwork from 'Chaudieres et Machines a Vapeur' (1911) by French civil engineer Max de Nansouty (1854-1913), part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.
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