Overlocker and autoclave: what they have in common

1. Step 1. Overlocker — evolved from — Sewing machine. A specialized sewing machine.
2. Step 2. Sewing machine — has part — Cam. Cams drive the fabric feed.
3. Step 3. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
4. Step 4. Trip hammer — evolved into — Steam hammer. The mechanization of forging.
5. Step 5. Steam hammer — has part — Boiler. A boiler supplies the steam.
6. Step 6. Boiler — is part of — Autoclave. A steam generator.

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