Circuit breaker and paper machine: what they have in common

1. Step 1. Circuit breaker — uses — Electromagnetism. An electromagnetic trip.
2. Step 2. Electromagnetism — is used in — Starter motor. A starter is an electric motor.
3. Step 3. Starter motor — evolved from — Crank. It replaced the starting crank.
4. Step 4. Crank — is part of — Spinning wheel. A foot drive through a crank.
5. Step 5. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
6. Step 6. Belt drive — is part of — Paper machine. The wire moves on belts and rolls.

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