Hydrometer und gutenberg printing press: was sie gemeinsam haben

1. Schritt 1. Hydrometer — nutzt — Archimedisches Prinzip. A hydrometer floats: the buoyant force depends on the liquid's density, so how deep it sinks shows the density.
2. Schritt 2. Archimedisches Prinzip — wird verwendet in — Boot. A vessel stays afloat by Archimedes’ principle.
3. Schritt 3. Boot — entwickelte sich zu — Sailing ship. Sailing ships grew out of rowing boats.
4. Schritt 4. Sailing ship — nutzt — Mercator projection. Navigating along straight rhumb lines.
5. Schritt 5. Mercator projection — nutzt — Gutenberg printing press. Maps were printed in large numbers.

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