Flail and heat pump: what they have in common

1. Step 1. Flail — evolved into — Threshing machine. A replacement for threshing by hand.
2. Step 2. Threshing machine — has part — Belt drive. Driven by a belt from a steam engine.
3. Step 3. Belt drive — is part of — Supercharger. Belt-driven from the crankshaft.
4. Step 4. Supercharger — is a kind of — Compressor. A supercharger.
5. Step 5. Compressor — is part of — Heat pump. A compressor.

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