Movable vise jaw and sonar: what they have in common

1. Step 1. Movable vise jaw — is part of — Vice. It clamps the part.
2. Step 2. Vice — uses — Screw. The jaws are closed by a screw.
3. Step 3. Screw — is used in — Propeller. A propeller “screws” itself into the water, like an Archimedes’ screw.
4. Step 4. Propeller — is part of — Submarine. A propeller.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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