Combined heat and power plant and archimedes’ screw: what they have in common

1. Step 1. Combined heat and power plant — has part — Steam turbine. Steam turns the turbine.
2. Step 2. Steam turbine — is part of — Destroyer. Turbines.
3. Step 3. Destroyer — has part — Torpedo. Torpedoes.
4. Step 4. Torpedo — has part — Propeller. Propellers.
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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