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                    Abacus is also used in schools as an aid in teaching the numeral system.



                      PASCALINE ADDING MACHINE

                  In 1642, a mathematician, Blaise Pascal
                  invented the calculating machine called

                  the  Pascaline  adding machine.  The
                  numbers were fed into the machine by
                  dialing them on the wheels. This device
                  is believed to be the first mechanical

                  calculator of the world. This machine                        Pascaline               Blaise Pascal
                  was  capable  of performing  only
                  addition and subtraction.


                      LEIBNIZ STEP RECKONER

                  In 1672, a mathematician, Gottfried Wilhelm
                  Leibniz  invented the digital mechanical

                  calculator  called ‘Step  Reckoner’. It was
                  the  first  calculator  that  could  perform  all
                  four arithmetic operations i.e., addition,
                                                                                        Leibniz Step Reckoner
                  subtraction, multiplication and division.

                      CHARLES BABBAGE’S ANALYTICAL ENGINE

                  In 1822, a mathematician, Charles Babbage developed a
                  steam-driven calculating machine, that was of the size of a

                  room, that he called the Difference Engine. But even after
                  working on this project for 10 years, this machine never
                  became a reality.



                                                                                                   Charles Babbage


                                                        In 1833, he invented a machine called the Analytical
                                                        Engine, the  first  ever  working  model  of  a
                                                        mechanical computer, a fully program-controlled

                                                        machine. That is why, Charles Babbage is known as
                                                        the ‘Father of Computers’.
                        Analytical Engine


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