Saw and bellows: what they have in common

1. Step 1. Saw — is used in — Sawmill. The cutting tool is a saw.
2. Step 2. Sawmill — has part — Water wheel. Early sawmills were driven by water wheels.
3. Step 3. Water wheel — is used in — Rolling mill. The first mills were turned by water.
4. Step 4. Rolling mill — is part of — Steel works. Rolling mills.
5. Step 5. Steel works — has part — Blast furnace. Blast furnaces.
6. Step 6. Blast furnace — has part — Bellows. Air was blown in by bellows, later by blowers.

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