Rotating gun mount and mechanical clock: what they have in common

1. Step 1. Rotating gun mount — is part of — Anti-aircraft gun. All-round traverse.
2. Step 2. Anti-aircraft gun — uses — Radar. Radar guidance.
3. Step 3. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.
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 from — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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