Acetylene and diesel engine: what they have in common

1. Step 1. Acetylene — is used in — Headlight. The first headlamps burned acetylene.
2. Step 2. Headlight — uses — Reflection of light. A reflector gathers the light into a beam.
3. Step 3. Reflection of light — is used in — Periscope. Reflection.
4. Step 4. Periscope — is part of — Submarine. A periscope.
5. Step 5. Submarine — has part — Diesel engine. Diesel-electric submarines.

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