Hammer and electronic calculator: what they have in common

1. Step 1. Hammer — evolved into — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
2. Step 2. Trip hammer — has part — Cam. Cams on the shaft lift the hammer.
3. Step 3. Cam — is part of — Sewing machine. Cams drive the fabric feed.
4. Step 4. Sewing machine — has part — Crank. A crank turns rotation into the stroke of the needle.
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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