Mechanical calculator and heat pump: what they have in common

1. Step 1. Mechanical calculator — evolved into — Leibniz’s stepped reckoner. Leibniz developed Pascal’s idea by adding multiplication.
2. Step 2. Leibniz’s stepped reckoner — evolved into — Arithmometer. Thomas’s arithmometer used Leibniz’s stepped drum.
3. Step 3. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
4. Step 4. Electronic calculator — has part — Solar panel. Many run on a solar cell.
5. Step 5. Solar panel — is used in — Energy-efficient house. Solar energy.
6. Step 6. Energy-efficient house — uses — Heat pump. Heating.

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