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.