Furnace bath with molten steel and aeroplane: what they have in common

1. Step 1. Furnace bath with molten steel — is part of — Open-hearth furnace. A flat hearth with liquid metal.
2. Step 2. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
3. Step 3. Steel works — has part — Rolling mill. Rolling mills.
4. Step 4. Rolling mill — is used in — Railway track. Rails are rolled.
5. Step 5. Railway track — is used in — Wright Flyer. The Flyer had no wheels: it took off along a wooden rail.
6. Step 6. Wright Flyer — is a kind of — Aeroplane. The first aeroplane.

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