Bread machine and vacuum pump: what they have in common

1. Step 1. Bread machine — has part — Heating element. A heater.
2. Step 2. Heating element — is part of — Espresso machine. A heater.
3. Step 3. Espresso machine — has part — Boiler. A boiler.
4. Step 4. Boiler — is part of — Newcomen engine. Steam from the boiler.
5. Step 5. Newcomen engine — has part — Piston pump. The beam drove a mine pump.
6. Step 6. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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