Taximeter and smart meter: what they have in common

1. Step 1. Taximeter — evolved from — Odometer. A distance counter with a fare rate.
2. Step 2. Odometer — is part of — Dashboard. An odometer.
3. Step 3. Dashboard — has part — Speedometer. A speedometer.
4. Step 4. Speedometer — has part — Permanent magnet. A rotating magnet drags the needle.
5. Step 5. Permanent magnet — is part of — Electricity meter. A braking magnet.
6. Step 6. Electricity meter — evolved into — Smart meter. A digital meter.

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