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Calculating Stock PhotoAccuracy,Calculator,Close-up,Color Image,Consumerproduct,Counting Instrument,Day,Eyeglasses,Eyesight,Horizontal,Indoors,Machine Part,Machinery,Milwaukee - Wisconsin,No People,Number,Photography,Push Button,Selective Focus,Technology,Transparent,USA,WisconsinPhotographer Monica L GerdsCollection: Moment Open © 2005 Monica GerdsFrenchman Blaise Pascal is credited with inventing the first calculating machine in 1642. It was a numerical wheel calculator called the Pascaline to help his father, a French tax collector, count taxes. Incidentally, the unit of atmospheric pressure (Pa) is also named in honor of Pascal, whose experiments greatly increased knowledge of the atmosphere.However, the first mechanical calculator may have been conceived by Leonardo da Vinci almost one hundred and fifty years earlier than Pascal's machine. Working models of his machine have been constructed.