Power socket and davy lamp: what they have in common

1. Step 1. Power socket — is made of — Porcelain. The body is ceramic, later plastic.
2. Step 2. Porcelain — is a kind of — Pottery. Ceramics.
3. Step 3. Pottery — uses — Fire making. The first pottery was fired right in a campfire.
4. Step 4. Fire making — evolved into — Lighter. A fire striker.
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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