Combine harvester and atomic clock: what they have in common

1. Step 1. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.
2. Step 2. Diesel engine — is part of — Submarine. Diesel-electric submarines.
3. Step 3. Submarine — has part — Sonar. Underwater acoustics.
4. Step 4. Sonar — uses — Piezoelectric effect. Langevin’s transducer is piezoelectric quartz.
5. Step 5. Piezoelectric effect — is used in — Quartz clock. The quartz resonator vibrates thanks to the piezoelectric effect.
6. Step 6. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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