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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Zhang Heng, an astronomer, mathematician, and inventor serving under the Han Dynasty, introduced this groundbreaking instrument to the imperial court with a promise—it could detect the direction of an earthquake, a claim surely seen as audacious at the time. The seismoscope itself was a large bronze vessel, adorned with eight dragons on its surface, each facing one of the cardinal directions. Below each dragon's mouth, a frog with an open mouth was positioned, ready to catch a ball the dragon mi
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