Corkscrew spiral worm and heron’s aeolipile: what they have in common

1. Step 1. Corkscrew spiral worm — is part of — Corkscrew. A helical spiral.
2. Step 2. Corkscrew — uses — Screw. A spiral.
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 — Ocean liner. Propellers.
5. Step 5. Ocean liner — has part — Turbine. Large liners run on steam turbines.
6. Step 6. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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