Regenerator checkerwork and shaduf: what they have in common

1. Step 1. Regenerator checkerwork — is part of — Open-hearth furnace. Checkerwork heats the air and gas with the heat of the exhaust gases.
2. Step 2. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
3. Step 3. Steel works — has part — Blast furnace. Blast furnaces.
4. Step 4. Blast furnace — is made of — Stone. The shaft of a blast furnace is stone.
5. Step 5. Stone — is material for — Well. The walls of wells were lined with stone.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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