Model of Zhang Heng's seismoscope

Model of Zhang Heng's seismoscope

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Caption: Model of Zhang Heng's seismoscope. The Chinese scientist Zhang Heng (78-139) invented this seismoscope in 132 AD. The instrument was two metres in diameter, with metal balls balanced in each of the eight dragons' mouths. Strong seismic tremors caused a ball to be released from the mouth of a dragon into the mouth of the toad below. The position of the ball falling indicated the direction of the shock wave. This 1973 model is from a collection held at the Science Museum, London, UK.

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Keywords: 1, 132 ad, 1900s, 1973, 20th century, 2nd century, asian, chinese, detection, detector, device, display, dragon, dragons, equipment, europe, european, exhibit, geological, geology, historical, history, london, metal, model, museum, natural history museum, one, research, science museum, seismic, seismology, seismometer, seismoscope, single, studio shot, technological, technology, toad, toads, tremor, tremors, zhang heng

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