Bronze dragon heads holding balls and hammer: what they have in common

1. Step 1. Bronze dragon heads holding balls — is part of — Zhang Heng’s seismoscope. Eight directions.
2. Step 2. Zhang Heng’s seismoscope — is made of — Bronze. A bronze vessel.
3. Step 3. Bronze — is material for — Cylinder. The cylinders of Ctesibius’s pump are bronze.
4. Step 4. Cylinder — is part of — Steam hammer. A steam cylinder.
5. Step 5. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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