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There have been many natural disasters since ancient times. In order to fight against violence of nature and improve people's life, many scientists created lots of inventions. Here is one of them.
Zhang Heng (78AD～139AD) was a great astronomer, mathematician, artist and literary scholar in the Eastern Han Dynasty of China. Born in today's Nanyang County, Henan, he was a good writer at age 12. At the age of 16, he left home to pursue his studying in the capital city. He spent at least 10 years of his youth in literary studies and writing. He published several well－recognized literary writings. Much to everyone's amazement, he turned to astronomy after age 30 and at last he succeeded.
In the year 123 he corrected the calendar to bring it into line with the seasons. In 132 Zhang Heng invented the first seismograph(地震仪) for measuring earthquakes. His device was in the shape of a cylinder(圆柱) with eight dragon heads around the top, each with a ball in its mouth. Around the bottom were eight frogs, each
