Gutenberg printing press and lead–acid battery: what they have in common

1. Step 1. Gutenberg printing press — uses — Ink. An impression needs ink; Gutenberg used an oil-based one.
2. Step 2. Ink — is used in — Inkjet printer. Ink.
3. Step 3. Inkjet printer — uses — Piezoelectric effect. Piezo heads eject droplets.
4. Step 4. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.
5. Step 5. Sonar — is part of — Submarine. Underwater acoustics.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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