Quartz clock and tank: what they have in common

1. Step 1. Quartz clock — uses — Piezoelectric effect. The quartz resonator vibrates thanks to the piezoelectric effect.
2. Step 2. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.
3. Step 3. Sonar — is part of — Submarine. Underwater acoustics.
4. Step 4. Submarine — has part — Periscope. A periscope.
5. Step 5. Periscope — is part of — Tank. Observation devices.

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