Headlight and bell: what they have in common

1. Step 1. Headlight — uses — Acetylene. The first headlamps burned acetylene.
2. Step 2. Acetylene — is used in — Carbide lamp. Burning acetylene.
3. Step 3. Carbide lamp — has part — Valve. It regulates the water supply.
4. Step 4. Valve — is part of — Valve trumpet. Valves.
5. Step 5. Valve trumpet — uses — Resonance. Resonance of the tube.
6. Step 6. Resonance — is used in — Bell. The sound.

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