Grill air vents and windlass: what they have in common

1. Step 1. Grill air vents — is part of — Grill. They regulate the airflow.
2. Step 2. Grill — uses — Charcoal. Charcoal.
3. Step 3. Charcoal — is used in — Blast furnace. Before coke, blast furnaces ran on charcoal.
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 — Windlass. The bucket was raised with a windlass.

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