Cylinder seal and boyle’s air pump: 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 — Piston. Steam pushes the piston in the cylinder.
5. Step 5. Piston — is part of — Boyle’s air pump. A plunger.

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