Sledge and davy lamp: what they have in common

1. Step 1. Sledge — uses — Friction. Low friction of the runners on snow.
2. Step 2. Friction — is used in — Flintlock. A spark from a strike of flint.
3. Step 3. Flintlock — works like — Lighter. The same way of striking a spark.
4. Step 4. Lighter — has part — Wick. Petrol lighters have a wick.
5. Step 5. Wick — is part of — Davy lamp. A wick.

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