Electrical grid and windlass: what they have in common

1. Step 1. Electrical grid — has part — Power station. Power stations feed the grid.
2. Step 2. Power station — is made of — Brick. The buildings of the first power stations were brick.
3. Step 3. Brick — is material for — Metro. The vaults of the first tunnels are brick.
4. Step 4. Metro — has part — Turnstile. Turnstiles.
5. Step 5. Turnstile — has part — Ratchet. A ratchet.
6. Step 6. Ratchet — is part of — Windlass. A ratchet holds the load.

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