Folding legs and newcomen engine: what they have in common

1. Step 1. Folding legs — is part of — Ironing board. Scissor supports.
2. Step 2. Ironing board — is used in — Electric iron. Ironing.
3. Step 3. Electric iron — has part — Heating element. A heater.
4. Step 4. Heating element — is part of — Espresso machine. A heater.
5. Step 5. Espresso machine — has part — Boiler. A boiler.
6. Step 6. Boiler — is part of — Newcomen engine. Steam from the boiler.

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