Loom and railway track: what they have in common

1. Step 1. Loom — evolved into — Power loom. A mechanized loom.
2. Step 2. Power loom — has part — Cam. Cams lift the heddles.
3. Step 3. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
4. Step 4. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.
6. Step 6. Rolling mill — is used in — Railway track. Rails are rolled.

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