Pitchfork and davy lamp: what they have in common

1. Step 1. Pitchfork — has part — Handle. A handle.
2. Step 2. Handle — is part of — Toothbrush. A plastic handle.
3. Step 3. Toothbrush — is made of — Plant fibre. The bristles were hog hair, later nylon.
4. Step 4. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
5. Step 5. Wick — is part of — Davy lamp. A wick.

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