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Historians believe that Chinese philosopher Chang Heng invented the first device to measure earthquakes in AD 132. It is described as a large urn with eight dragon heads popping out of it. Each head faced one of the eight principal directions of the compass- North,South,East,West,Northeast,Southeast,Northwest and Southwest. And a toadwith its mouth open squatted below each dragon head. When an earthquake hit, a ball would release from one or more of the eight dragons and fall into the toads mouth. By this, the direction of the approaching earthquqke could be determined. Reports indicate that Heng's device detected an earthquake 400 miles/ 644 km away. There were other devices like these to detect earthquakes but this was the best one. Devices to "measure" earthquakes were not very accurate in ancient times, in fact, there were hardly any such devices.

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