Counterweight and jacquard loom: what they have in common

1. Step 1. Counterweight — is used in — Trebuchet. A falling counterweight swings the throwing arm.
2. Step 2. Trebuchet — has part — Wooden frame. A supporting frame with an axle.
3. Step 3. Wooden frame — is part of — Warp-weighted loom. Two uprights and a beam.
4. Step 4. Warp-weighted loom — is a kind of — Loom. An ancient loom.
5. Step 5. Loom — includes — Jacquard loom. A loom with punched cards.

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