Water turbine and needle: what they have in common

1. Step 1. Water turbine — evolved from — Water wheel. The turbine is a development of the water wheel.
2. Step 2. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
3. Step 3. Trip hammer — has part — Cam. Cams on the shaft lift the hammer.
4. Step 4. Cam — is part of — Sewing machine. Cams drive the fabric feed.
5. Step 5. Sewing machine — has part — Needle. A needle with the eye near its point.

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