Ferrocerium (lighter flint) and gas lamp: what they have in common

1. Step 1. Ferrocerium (lighter flint) — is part of — Lighter. The flint strikes sparks.
2. Step 2. Lighter — has part — Wick. Petrol lighters have a wick.
3. Step 3. Wick — is part of — Oil lamp. The wick feeds oil to the flame.
4. Step 4. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
5. Step 5. Incandescent light bulb — evolved from — Gas lamp. Electricity displaced gas lighting.

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