Incandescent light bulb and davy lamp: what they have in common

1. Step 1. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.
2. Step 2. Oil lamp — has part — Wick. The wick feeds oil to the flame.
3. Step 3. Wick — is part of — Davy lamp. A wick.

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