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ABACUS—FIRST CALCULATING DEVICE


                  The first step towards computing was the invention of Abacus
                  around 3000 years ago, in China. It is a wooden frame with beads
                  on parallel wires which can do simple calculations like addition
                  and subtraction. This device is used to calculate numbers at a
                  fast speed.

                   Clickipedia                                                                            Abacus



                    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


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