Bow thruster and mechanical clock: what they have in common

1. Step 1. Bow thruster — is part of — Ferry. Thrusters.
2. Step 2. Ferry — uses — Archimedes’ principle. It stays afloat by Archimedes’ principle.
3. Step 3. Archimedes’ principle — is used in — Diving bell. Sinking with ballast.
4. Step 4. Diving bell — has part — Bell. A body open at the bottom.
5. Step 5. Bell — is part of — Alarm clock. A bell rings.
6. Step 6. Alarm clock — is a kind of — Mechanical clock. A clock.

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