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Typing for SSC CHSL

created Jul 1st, 02:50 by JitendraKumar2



189 words
88 completed
No one knows when or by whom rockets were invented. In all probability the rocket was not suddenly invented but evolved gradually over a long period of time, perhaps in different parts of world at the same time. Some historians of rocketry,notably Willy Ley, trace the development of rockets to the 13th century China, a land noted in ancient times for its fire work display. In the Year 1232 AD when the Mongols laid siege to the city of Kai-Feng fu, the capital of honan province, the Chines defenders used weapons that were described as "arrows of flying fire. There is no explicit statement that that these arrows were rockets, but some students have concluded that they were because the record does not mentioned bows or other means of shooting the arrows. In the same battle, we read defenders dropped from the walls of the city a kind of bomb described as "heaven-shaking thunder". From these meagre references some students have conclude that the Chinese, by the year 1232 had discovered gunpowder and had learned to use it to make explosive bombs as well as propulsive charges for rockets.

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