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The design of Heng's seismograph was indicative of Chinese artistry. The kettle sported eight dragonheads arranged in eight directions around the outside rim. Each head held a ball in its mouth. At the base of the vessel were eight corresponding toads with their empty mouths open. The "toothed machinery and ingenious constructions" inside the device were hidden. Actually it was an inverted pendulum that reacted to the slightest tremor of the earth. The pendulum swung, tapping a mechanism that ejected one of the balls from the corresponding dragonhead. The ball would fall into the waiting toad's mouth sitting directly under it and make a loud http://www.answers.com/topic/clanglang. Whichever toad had the ball indicated the direction of the earthquake's location.

To say in the least, a tremor from an earthquake will cause one of the balls to drop from the dragon's mouth and land in the frog's mouth. The direction of the earthquake can be said from which frog's mouth the ball lands into.

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Q: How does the Zhang Heng Seismograph work and can anyone tell you how to make it work?
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