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seismoscope

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Images

Bronze replica of Zhang Heng's ancient seismoscope featuring a central ornate vessel with dragon heads around its sides and open-mouthed toads positioned below each dragon.

seismoscope: Media

seismic instrument

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Images

Bronze replica of Zhang Heng's ancient seismoscope featuring a central ornate vessel with dragon heads around its sides and open-mouthed toads positioned below each dragon.

Zhang Heng: seismoscope

Model of Zhang Heng's seismoscope (seismograph), which he invented about 132

© SSPL/Getty Images

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