Bus and windlass: what they have in common

1. Step 1. Bus — has part — Diesel engine. The engine is usually a diesel.
2. Step 2. Diesel engine — is part of — Drilling rig. The drive.
3. Step 3. Drilling rig — has part — Block and tackle. The block and tackle lifts the drill string.
4. Step 4. Block and tackle — is part of — Crane (ancient). The crane lifted loads with a block and tackle.
5. Step 5. Crane (ancient) — has part — Windlass. The rope was wound on a windlass.

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