Metering chip module and steam locomotive: what they have in common

1. Step 1. Metering chip module — is part of — Smart meter. An ADC measures current and voltage.
2. Step 2. Smart meter — has part — Liquid-crystal display. A display.
3. Step 3. Liquid-crystal display — is part of — Electronic calculator. An LCD display.
4. Step 4. Electronic calculator — evolved from — Arithmometer. Electronics replaced mechanics.
5. Step 5. Arithmometer — has part — Crank. The handle for adding and subtracting.
6. Step 6. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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