Rotor and piston pump: what they have in common

1. Step 1. Rotor — is part of — Electric generator. The rotating part with a magnetic field.
2. Step 2. Electric generator — has part — Stator. The stationary part with the windings.
3. Step 3. Stator — is part of — Vacuum pump. A cylindrical chamber.
4. Step 4. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.

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