Freewheel and piston pump: what they have in common

1. Step 1. Freewheel — uses — Torque. It transmits torque in one direction only.
2. Step 2. Torque — is used in — Rack and pinion. The rotation of the pinion becomes the travel of the rack.
3. Step 3. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.
4. Step 4. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.
5. Step 5. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.

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