Water buckets on a wheel and electronic calculator: what they have in common

1. Step 1. Water buckets on a wheel — is part of — Noria. Pots on the rim lift the water.
2. Step 2. Noria — uses — Water wheel. The current itself turns the wheel.
3. Step 3. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
4. Step 4. Sawmill — has part — Crank. A crank turns the wheel’s rotation into the stroke of the saw.
5. Step 5. Crank — is part of — Arithmometer. The handle for adding and subtracting.
6. Step 6. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.

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