Fax and archimedes’ screw: what they have in common

1. Step 1. Fax — uses — Electrochemical reaction. The paper darkened under current.
2. Step 2. Electrochemical reaction — is used in — Lead–acid battery. A reversible reaction of lead and lead dioxide in sulfuric acid.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — has part — Propeller. A propeller.
5. Step 5. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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