Bronze toads with open mouths and bellows: what they have in common

1. Step 1. Bronze toads with open mouths — is part of — Zhang Heng’s seismoscope. They catch the ball when it drops.
2. Step 2. Zhang Heng’s seismoscope — is made of — Bronze. A bronze vessel.
3. Step 3. Bronze — is material for — Pipe organ. The pipes of the hydraulis were bronze.
4. Step 4. Pipe organ — has part — Bellows. Bellows supply the air.

Open Evothings