Superfluidity and windlass: what they have in common

1. Step 1. Superfluidity — uses — Helium. Liquid helium.
2. Step 2. Helium — is used in — Airship. After the Hindenburg — helium.
3. Step 3. Airship — has part — Propeller. Air propellers.
4. Step 4. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
5. Step 5. Archimedes’ screw — has part — Crank. A handle or rotary drive.
6. Step 6. Crank — is used in — Windlass. The handle of a windlass is a crank.

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