Ancient bronze vessel and screw press: what they have in common

1. Step 1. Ancient bronze vessel — is part of — Zhang Heng’s seismoscope. A hull.
2. Step 2. Zhang Heng’s seismoscope — is made of — Bronze. A bronze vessel.
3. Step 3. Bronze — is material for — Worm gear. Worm gears are bronze.
4. Step 4. Worm gear — uses — Screw. The worm is a screw.
5. Step 5. Screw — is used in — Screw press. The force is produced by turning a screw.

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