Bellows and windlass: what they have in common

1. Step 1. Bellows — is part of — Blast furnace. Air was blown in by bellows, later by blowers.
2. Step 2. Blast furnace — is part of — Steel works. Blast furnaces.
3. Step 3. Steel works — has part — Overhead crane. Overhead cranes.
4. Step 4. Overhead crane — has part — Block and tackle. A block and tackle.
5. Step 5. Block and tackle — is part of — Crane (ancient). The crane lifted loads with a block and tackle.
6. Step 6. Crane (ancient) — has part — Windlass. The rope was wound on a windlass.

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