The seismoscope designed by Zhang Heng, a brilliant astronomer and mathematician, was no ordinary invention. Crafted meticulously, the instrument featured eight dragons mounted around a circular bronze vessel, each facing a different direction. Beneath these dragons were bronze toads, with their mouths open wide. In the event of an earthquake, a mechanism inside the seismoscope would trigger, causing a ball to drop from a dragon’s mouth into the toad below, indicating the earthquake's direction.
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