Lighthouse lamp and screw press: what they have in common

1. Step 1. Lighthouse lamp — is part of — Lighthouse. The lamp: oil, kerosene, then electricity.
2. Step 2. Lighthouse — is part of — Seaport. A lighthouse.
3. Step 3. Seaport — uses — Sailing ship. A port receives ships.
4. Step 4. Sailing ship — uses — Mercator projection. Navigating along straight rhumb lines.
5. Step 5. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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