Keel and rolling mill: what they have in common

1. Step 1. Keel — is part of — Yacht. A keel.
2. Step 2. Yacht — has part — Sail. Sails.
3. Step 3. Sail — is part of — Windmill. A windmill’s sails are cloths on rotating arms.
4. Step 4. Windmill — works like — Watermill. The same mill, but with a different source of energy.
5. Step 5. Watermill — has part — Water wheel. A water wheel drives the mill’s mechanism.
6. Step 6. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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