Spinning mule and heat pump: what they have in common

1. Step 1. Spinning mule — evolved from — Arkwright’s water frame. A hybrid of two machines.
2. Step 2. Arkwright’s water frame — has part — Water wheel. Driven by water.
3. Step 3. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
4. Step 4. Turbine — is part of — Gas turbine. A turbine.
5. Step 5. Gas turbine — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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