Level frame and gutenberg printing press: what they have in common

1. Step 1. Level frame — is part of — Spirit level. A straight base ruler.
2. Step 2. Spirit level — uses — Universal gravitation. The bubble rises to the highest point.
3. Step 3. Universal gravitation — is used in — Anchor. Weight and grip on the seabed.
4. Step 4. Anchor — is part of — Sailing ship. An anchor.
5. Step 5. Sailing ship — uses — Mercator projection. Navigating along straight rhumb lines.
6. Step 6. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.

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