Thimble and archimedes’ screw: what they have in common

1. Step 1. Thimble — is made of — Bronze. Ancient thimbles were bronze.
2. Step 2. Bronze — is material for — Propeller. Bronze does not rust in seawater.
3. Step 3. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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