Tanker and micrometer: what they have in common

1. Step 1. Tanker — has part — Diesel engine. A diesel.
2. Step 2. Diesel engine — is part of — Submarine. Diesel-electric submarines.
3. Step 3. Submarine — has part — Propeller. A propeller.
4. Step 4. Propeller — uses — Screw. A propeller “screws” itself into the water, like an Archimedes’ screw.
5. Step 5. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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