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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.

                                                                   Abacus

                                   Brainy Fact

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

                                Charles Babbage’s Analytical Engine

                     In 1822, Charles Babbage, a mathematician, developed a steam-driven calculating
                     machine, which 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.

                                                                                    Evolution of Computers       9

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