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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,
                                                                                  Leibniz Step Reckoner
            multiplication and division.


                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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