Mechanical television and boiler: what they have in common

1. Step 1. Mechanical television — evolved into — Television. Electronic TV replaced mechanical TV.
2. Step 2. Television — is used in — Television set. It receives television.
3. Step 3. Television set — has part — Cathode-ray tube. A picture tube.
4. Step 4. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
5. Step 5. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
6. Step 6. Newcomen engine — has part — Boiler. Steam from the boiler.

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