Round clarifier tank and archimedes’ screw: what they have in common

1. Step 1. Round clarifier tank — is part of — Sewage treatment plant. Separating sludge from the treated water.
2. Step 2. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
3. Step 3. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
4. Step 4. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.
5. Step 5. Electric fan — has part — Propeller. The blades.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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