Well and personal computer: what they have in common

1. Step 1. Well — uses — Windlass. The bucket was raised with a windlass.
2. Step 2. Windlass — uses — Crank. The handle of a windlass is a crank.
3. Step 3. Crank — is part of — Arithmometer. The handle for adding and subtracting.
4. Step 4. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
5. Step 5. Electronic calculator — evolved into — Microprocessor. The Intel 4004 was designed for a Busicom calculator.
6. Step 6. Microprocessor — is part of — Personal computer. The PC became possible thanks to the microprocessor.

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