Dimpled thimble and sonar: what they have in common

1. Step 1. Dimpled thimble — is part of — Thimble. Dimples brace the eye of the needle.
2. Step 2. Thimble — is made of — Bronze. Ancient thimbles were bronze.
3. Step 3. Bronze — is material for — Propeller. Bronze does not rust in seawater.
4. Step 4. Propeller — is part of — Submarine. A propeller.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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