Oar shaft and watt steam engine: what they have in common

1. Step 1. Oar shaft — is part of — Oar. A long rod.
2. Step 2. Oar — is part of — Boat. A boat was moved by oars.
3. Step 3. Boat — is used in — Canal. For vessels.
4. Step 4. Canal — has part — Canal lock. Locks.
5. Step 5. Canal lock — has part — Valve. Sluice gates.
6. Step 6. Valve — is part of — Watt steam engine. A slide valve distributes the steam.

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