Glass bell jar receiver e rolling mill: o que têm em comum

1. Passo 1. Glass bell jar receiver — faz parte de — Bomba de ar de Boyle. A bell jar from which the air is pumped out.
2. Passo 2. Bomba de ar de Boyle — tem como parte — Valve. Valves.
3. Passo 3. Valve — faz parte de — Fole. A valve in the bellows lets air in when they open and keeps it from escaping back.
4. Passo 4. Fole — faz parte de — Alto-forno. Air was blown in by bellows, later by blowers.
5. Passo 5. Alto-forno — faz parte de — Steel works. Blast furnaces.
6. Passo 6. Steel works — tem como parte — Rolling mill. Rolling mills.

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