Tuyeres and greenhouse: what they have in common

1. Step 1. Tuyeres — is part of — Bessemer converter. Holes in the bottom for blowing air through.
2. Step 2. Bessemer converter — uses — Cast iron. Molten pig iron is blown with air.
3. Step 3. Cast iron — is material for — Crystal Palace. Cast iron.
4. Step 4. Crystal Palace — was inspired by — Greenhouse. Paxton was a gardener and a builder of glasshouses.

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