Level frame e gutenberg printing press: o que têm em comum

1. Passo 1. Level frame — faz parte de — Spirit level. A straight base ruler.
2. Passo 2. Spirit level — utiliza — Universal gravitation. The bubble rises to the highest point.
3. Passo 3. Universal gravitation — é utilizado em — Âncora. Weight and grip on the seabed.
4. Passo 4. Âncora — faz parte de — Sailing ship. An anchor.
5. Passo 5. Sailing ship — utiliza — Mercator projection. Navigating along straight rhumb lines.
6. Passo 6. Mercator projection — utiliza — Gutenberg printing press. Maps were printed in large numbers.

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