Cipher rotors and boyle’s air pump: what they have in common

1. Step 1. Cipher rotors — is part of — Cipher machine. Discs with cross wiring.
2. Step 2. Cipher machine — has part — Gear. Wheels set the cipher.
3. Step 3. Gear — includes — Rack and pinion. A gear and a rack.
4. Step 4. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.

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