Brick and shaduf: what they have in common

1. Step 1. Brick — is material for — Metro. The vaults of the first tunnels are brick.
2. Step 2. Metro — has part — Turnstile. Turnstiles.
3. Step 3. Turnstile — has part — Ratchet. A ratchet.
4. Step 4. Ratchet — is part of — Windlass. A ratchet holds the load.
5. Step 5. Windlass — is used in — Well. The bucket was raised with a windlass.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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