Tai Chung Natural Science Museum

Taichung Natural Science Museum

The clock is powered by water, which fills up buckets of water on a rotation wheel. The water gradually gets heavy enough to make a shift in the sprocket, moving it by one teeth.
Earthquake detection system
The instrument was said to resemble a jar with eight dragons positioned face down along the outside of the barrel, marking the primary compass directions. In each dragon’s mouth was a small bronze ball. Beneath the dragons sat eight bronze toads, with their broad mouths gaping to receive the balls.

When the instrument sensed an incoming seismic wave, one of the balls would drop and the sound would alert observers to the earthquake, giving a rough indication of the earthquake’s direction of origin.

This tells the position of the stars

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