Zhang Heng seismoscope, 132 AD.
3 4 c m
actual image size: 32cm x 26cm

Zhang Heng seismoscope, 132 AD.

© Science Museum / Science & Society Picture Library


Detail. The Chinese astronomer, mathematician and seismologist, Zhang Heng (78-139 AD) described the earliest seismoscope known in about 132 AD. Arriving shock waves displace a pendulum linked to a mechanism which opens the jaws of the dragon facing the direction of the earthquake. A ball falls from the dragon's teeth into the mouth of a toad below to record the event.

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