Spinning mule and sewage treatment plant: what they have in common

1. Step 1. Spinning mule — evolved from — Arkwright’s water frame. A hybrid of two machines.
2. Step 2. Arkwright’s water frame — has part — Water wheel. Driven by water.
3. Step 3. Water wheel — uses — Gravity flow. Falling or flowing water turns the wheel.
4. Step 4. Gravity flow — is used in — Sewerage. Waste water flows down a gradient.
5. Step 5. Sewerage — has part — Sewage treatment plant. Treatment plants.

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