Cylinder seal and truck: what they have in common

1. Step 1. Cylinder seal — works like — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
2. Step 2. Gutenberg printing press — evolved into — Rotary printing press. Cylinders instead of a flat press.
3. Step 3. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
4. Step 4. Watt steam engine — has part — Planetary gear. Watt’s “sun and planet” gear got around the patent on the crank.
5. Step 5. Planetary gear — includes — Differential. A differential is a planetary mechanism.
6. Step 6. Differential — is part of — Truck. Differentials in the drive axles.

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