Selo cilíndrico e truck: o que têm em comum

1. Passo 1. Selo cilíndrico — funciona como — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
2. Passo 2. Gutenberg printing press — evoluiu para — Rotary printing press. Cylinders instead of a flat press.
3. Passo 3. Rotary printing press — tem como parte — Watt steam engine. The first rotary presses were steam-driven.
4. Passo 4. Watt steam engine — tem como parte — Planetary gear. Watt’s “sun and planet” gear got around the patent on the crank.
5. Passo 5. Planetary gear — inclui — Diferencial. A differential is a planetary mechanism.
6. Passo 6. Diferencial — faz parte de — Truck. Differentials in the drive axles.

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