Television and diesel engine: what they have in common

1. Step 1. Television — uses — Radio. The image is transmitted by radio.
2. Step 2. Radio — is part of — Sonobuoy. A radio transmitter.
3. Step 3. Sonobuoy — has part — Hydrophone. A hydrophone.
4. Step 4. Hydrophone — is part of — Sonar. The receiver.
5. Step 5. Sonar — is part of — Submarine. Underwater acoustics.
6. Step 6. Submarine — has part — Diesel engine. Diesel-electric submarines.

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