Mineral fertilizer and windlass: what they have in common

1. Step 1. Mineral fertilizer — uses — Sulfuric acid. Superphosphate is made with sulfuric acid.
2. Step 2. Sulfuric acid — is material for — Car battery. The electrolyte is a solution of sulfuric acid.
3. Step 3. Car battery — is used in — Starter motor. Power.
4. Step 4. Starter motor — evolved from — Crank. It replaced the starting crank.
5. Step 5. Crank — is used in — Windlass. The handle of a windlass is a crank.

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