Music printing and sonar: what they have in common

1. Step 1. Music printing — uses — Movable type. Music type.
2. Step 2. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
3. Step 3. Gutenberg printing press — uses — Ink. An impression needs ink; Gutenberg used an oil-based one.
4. Step 4. Ink — is used in — Inkjet printer. Ink.
5. Step 5. Inkjet printer — uses — Piezoelectric effect. Piezo heads eject droplets.
6. Step 6. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.

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