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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,
                  subtraction, multiplication and division.                            Leibniz Step Reckoner

                      CHARLES BABBAGE’S ANALYTICAL ENGINE


                  In 1822 a mathematician, Charles Babbage developed a
                  steam driven calculating machine, that was the size of a
                  room,  which  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. This is why Charles Babbage is known as

                                                        the ‘father of computers’.
                        Analytical Engine


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