Carbide lamp and gutenberg printing press: what they have in common

1. Step 1. Carbide lamp — evolved from — Davy lamp. Miners’ lamps.
2. Step 2. Davy lamp — has part — Wick. A wick.
3. Step 3. Wick — uses — Capillary action. Fuel rises up the wick by capillary forces.
4. Step 4. Capillary action — is used in — Fountain pen. Ink flows through the nib’s capillaries.
5. Step 5. Fountain pen — 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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