Steel blade and davy lamp: what they have in common

1. Step 1. Steel blade — is part of — Bayonet. The bayonet blade.
2. Step 2. Bayonet — is part of — Musket. A bayonet.
3. Step 3. Musket — has part — Flintlock. A flintlock.
4. Step 4. Flintlock — works like — Lighter. The same way of striking a spark.
5. Step 5. Lighter — has part — Wick. Petrol lighters have a wick.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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