Hollow quill barrel and radar: what they have in common

1. Step 1. Hollow quill barrel — is part of — Quill pen. A hollow shaft holds the ink.
2. Step 2. Quill pen — uses — Ink. It writes with ink.
3. Step 3. Ink — is used in — Inkjet printer. Ink.
4. Step 4. Inkjet printer — uses — Piezoelectric effect. Piezo heads eject droplets.
5. Step 5. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.
6. Step 6. Sonar — works like — Radar. The same echolocation principle: sound in water instead of radio waves.

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