Millstone and davy lamp: what they have in common

1. Step 1. Millstone — is made of — Stone. Millstones were hewn from hard stone.
2. Step 2. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).
3. Step 3. Oil lamp — has part — Wick. The wick feeds oil to the flame.
4. Step 4. Wick — is part of — Davy lamp. A wick.

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