Chinese earthquake detector, artwork

Chinese earthquake detector, artwork

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Caption: Chinese earthquake detector, artwork. This device was invented around 132 A.D., by Zhang Heng. It consists of a copper-domed urn with dragons' heads circling the outside, each containing a bronze ball, and a pendulum hung from its top inside. When the Earth shook, the pendulum would swing, knocking a ball from one of the dragon heads into the open mouth of a bronze toad below. The direction of the earthquake's epicentre could be determined from which ball had been released.

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Keywords: 2a.d., 2ad, 2nd century a.d., ancient chinese, artwork, ball, bronze, cut away, cut out, cut-away, cut-out, cutout, detecting, device, direction, dragon's head, dropping, early, earthquake detector, epicentre, heads, historical, history of science, illustration, instrument, mechanics, pendulum, physical, physics, seismograph, seismology, seisometer, swinging, technological, technology, toad, toads, urn

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