Sand temper and sonar: what they have in common

1. Step 1. Sand temper — is part of — Pottery. Sand or grog so the vessel does not crack in firing.
2. Step 2. Pottery — uses — Fire making. The first pottery was fired right in a campfire.
3. Step 3. Fire making — evolved into — Lighter. A fire striker.
4. Step 4. Lighter — uses — Piezoelectric effect. Piezo lighters.
5. Step 5. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.

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