Lathe and davy lamp: what they have in common

1. Step 1. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
2. Step 2. Rope — is made of — Plant fibre. Rope is twisted from plant fibres.
3. Step 3. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
4. Step 4. Wick — is part of — Davy lamp. A wick.

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