Zhang Heng’s Seismometer

Origin
Zhang Heng was a polymath of the Han Dynasty. He was a poet, astrologer, mathematician, and geographer among other things. He designed the first seismometer in recorded history. Granted, his use of the device was entirely unscientific. Due to the Taoist beliefs held by the court, it was believed that earthquakes were caused by imbalances within the earth. Heng believed that earthquakes were caused by enraged air escaping from the earth after it had been trapped for a long time.

Effects
Points in the general direction of the source of any seismic activity it senses. The heads of the dragon will light up, and one of the frogs will swivel around in the direction of the source.

Collection
Collected along with several other artifacts from Subhas Chandra Bose.