Mechanical clock and radar: what they have in common

1. Step 1. Mechanical clock — evolved into — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
2. Step 2. Quartz clock — uses — Piezoelectric effect. The quartz resonator vibrates thanks to the piezoelectric effect.
3. Step 3. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.
4. Step 4. Sonar — works like — Radar. The same echolocation principle: sound in water instead of radio waves.

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