Colour television and submarine: what they have in common

1. Step 1. Colour television — is a kind of — Television. Television.
2. Step 2. Television — uses — Radio. The image is transmitted by radio.
3. Step 3. Radio — is part of — Sonobuoy. A radio transmitter.
4. Step 4. Sonobuoy — has part — Hydrophone. A hydrophone.
5. Step 5. Hydrophone — is part of — Sonar. The receiver.
6. Step 6. Sonar — is part of — Submarine. Underwater acoustics.

Open Evothings