Refraction of light and gutenberg printing press: what they have in common

1. Step 1. Refraction of light — is used in — Lens. A lens focuses light by refraction.
2. Step 2. Lens — is part of — Sextant. The sextant’s telescope.
3. Step 3. Sextant — is part of — Sailing ship. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
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.

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