Wooden frame and hammer: what they have in common

1. Step 1. Wooden frame — is part of — Warp-weighted loom. Two uprights and a beam.
2. Step 2. Warp-weighted loom — is a kind of — Loom. An ancient loom.
3. Step 3. Loom — evolved into — Power loom. A mechanized loom.
4. Step 4. Power loom — has part — Cam. Cams lift the heddles.
5. Step 5. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
6. Step 6. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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