Sonar transducer and personal computer: what they have in common

1. Step 1. Sonar transducer — is part of — Echo sounder. It sends out a sound pulse.
2. Step 2. Echo sounder — evolved into — Sonar. Echolocation.
3. Step 3. Sonar — works like — Ultrasound scanner. A medical sonar: the same echo principle.
4. Step 4. Ultrasound scanner — has part — Monitor. A screen.
5. Step 5. Monitor — is part of — Personal computer. A monitor.

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