Fresnel lens and rolling mill: what they have in common

1. Step 1. Fresnel lens — is part of — Lighthouse. A stepped lens gathers the light into a beam.
2. Step 2. Lighthouse — uses — Combustion. Ancient lighthouses shone with fire.
3. Step 3. Combustion — is used in — Charcoal. Burning wood without air.
4. Step 4. Charcoal — is used in — Blast furnace. Before coke, blast furnaces ran on charcoal.
5. Step 5. Blast furnace — is part of — Steel works. Blast furnaces.
6. Step 6. Steel works — has part — Rolling mill. Rolling mills.

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