Power loom and electronic calculator: what they have in common

1. Step 1. Power loom — has part — Cam. Cams lift the heddles.
2. Step 2. Cam — is part of — Sewing machine. Cams drive the fabric feed.
3. Step 3. Sewing machine — has part — Crank. A crank turns rotation into the stroke of the needle.
4. Step 4. Crank — is part of — Arithmometer. The handle for adding and subtracting.
5. Step 5. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.

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