Rotary vane rotor and submarine: what they have in common

1. Step 1. Rotary vane rotor — is part of — Vacuum pump. Vanes cut off portions of gas.
2. Step 2. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
3. Step 3. Piston pump — has part — Cylinder. The piston moves in a cylinder.
4. Step 4. Cylinder — is part of — Diesel engine. Cylinders.
5. Step 5. Diesel engine — is part of — Submarine. Diesel-electric submarines.

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