Wheel head and paper machine: what they have in common

1. Step 1. Wheel head — is part of — Potter’s wheel. A spinning disc for shaping.
2. Step 2. Potter’s wheel — uses — Angular momentum. A heavy disc keeps spinning by inertia.
3. Step 3. Angular momentum — is used in — Spindle. Spinning the spindle twists the thread.
4. Step 4. Spindle — evolved into — Spinning wheel. A wheel turns the spindle.
5. Step 5. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
6. Step 6. Belt drive — is part of — Paper machine. The wire moves on belts and rolls.

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