Mechanical calculator and kite: 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 — has part — Crank. The handle for adding and subtracting.
4. Step 4. Crank — is used in — Windlass. The handle of a windlass is a crank.
5. Step 5. Windlass — has part — Rope. A rope.
6. Step 6. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.

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