Seismometer
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seismometer
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seismograph
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The seismograph is a masterpiece created by Zhang Heng, a scientist during the Eastern Han Dynasty in China. The time of the initial construction of the seismograph is unknown. It was rebuilt in the first year of Yangjia of Emperor Shun of Han Dynasty (132 AD). It was the world's first seismograph and the first instrument in history to use scientific methods to determine the direction of earthquakes. The seismograph has eight directions, with dragon heads containing dragon balls in each direction. Below each head, there is a toad corresponding to it. If an earthquake occurs on either side, the dragon beads contained in the dragon mouth in that direction will fall into the toad's mouth, and thus the direction of the earthquake can be measured.
