Universal joint and vacuum pump: what they have in common

1. Step 1. Universal joint — has part — Shaft. Connects two shafts.
2. Step 2. Shaft — uses — Torque. A shaft transmits torque.
3. Step 3. Torque — is used in — Rack and pinion. The rotation of the pinion becomes the travel of the rack.
4. Step 4. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.
5. Step 5. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.

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