Potter’s wheel and air conditioner: what they have in common

1. Step 1. Potter’s wheel — has part — Axle. A vertical axis.
2. Step 2. Axle — is part of — Wheelset. A common axle.
3. Step 3. Wheelset — is part of — Bogie. The bogie carries the wheelsets.
4. Step 4. Bogie — is part of — Refrigerator car. Bogies.
5. Step 5. Refrigerator car — uses — Vapour-compression cycle. Later — refrigeration machines.
6. Step 6. Vapour-compression cycle — is used in — Air conditioner. The vapour-compression cycle.

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