Glass bell jar receiver and rolling mill: what they have in common

1. Step 1. Glass bell jar receiver — is part of — Boyle’s air pump. A bell jar from which the air is pumped out.
2. Step 2. Boyle’s air pump — has part — Valve. Valves.
3. Step 3. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
4. Step 4. Bellows — is part of — Blast furnace. Air was blown in by bellows, later by blowers.
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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