Wooden bellows boards and windlass: what they have in common

1. Step 1. Wooden bellows boards — is part of — Bellows. Rigid walls.
2. Step 2. Bellows — is part of — Blast furnace. Air was blown in by bellows, later by blowers.
3. Step 3. Blast furnace — is made of — Stone. The shaft of a blast furnace is stone.
4. Step 4. Stone — is material for — Well. The walls of wells were lined with stone.
5. Step 5. Well — uses — Windlass. The bucket was raised with a windlass.

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