Feedback control and mechanical clock: what they have in common

1. Step 1. Feedback control — is used in — Cruise control. Speed is held by feedback.
2. Step 2. Cruise control — has part — Speedometer. It compares with the speed reading.
3. Step 3. Speedometer — is part of — Dashboard. A speedometer.
4. Step 4. Dashboard — has part — Odometer. An odometer.
5. Step 5. Odometer — evolved into — Taximeter. A distance counter with a fare rate.
6. Step 6. Taximeter — has part — Mechanical clock. It measures the time of the ride.

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