An early seismic instrument called the seismoscope made no time record of ground oscillations but simply indicated that shaking had occurred. |
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They would have been taught, and proudly, that almost 2,000 years ago an astronomer named Chang Heng invented the world's first seismoscope. |
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His seismoscope for registering earthquakes was apparently cylindrical in shape, with eight dragons' heads arranged around its upper circumference, each with a ball in its mouth. |
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