Drafting rollers and car: what they have in common

1. Step 1. Drafting rollers — is part of — Spinning mule. From the water frame.
2. Step 2. Spinning mule — has part — Spindle. The carriage holds hundreds of spindles.
3. Step 3. Spindle — uses — Angular momentum. Spinning the spindle twists the thread.
4. Step 4. Angular momentum — is used in — Potter’s wheel. A heavy disc keeps spinning by inertia.
5. Step 5. Potter’s wheel — has part — Axle. A vertical axis.
6. Step 6. Axle — is part of — Car. A car's wheels sit on axles.

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