Chart recorder and gutenberg printing press: what they have in common

1. Step 1. Chart recorder — is part of — Echo sounder. It records the depth.
2. Step 2. Echo sounder — has part — Hydrophone. A hydrophone listens for the echo.
3. Step 3. Hydrophone — uses — Piezoelectric effect. A piezo element.
4. Step 4. Piezoelectric effect — is used in — Inkjet printer. Piezo heads eject droplets.
5. Step 5. Inkjet printer — uses — Ink. Ink.
6. Step 6. Ink — is used in — Gutenberg printing press. An impression needs ink; Gutenberg used an oil-based one.

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