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A replica of an ancient Chinese Siesmograph from Eastern Han Dynasty (25-220 CE)

This picture was taken in July 2004 from an exhibition at Chabot Space & Science Center in Oakland California.

The plaque of the exhibit said: Detecting a Quake
In 132 CE, after several serious earthquakes in China, astronomer Zhang Heng invented this instrument to warn people of the next one. When the ground shook, it moved a pendulum inside the jug. The pendulum pushed a lever that opened one dragon's mouth. A ball rolled out and into the toad's mouth below, sounding an alarm. The open dragon mouth pointed in the direction of the earthquake, notifying the Emperor.

候风地动仪复原模型

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