Throwing arm and centrifugal pump: what they have in common

1. Step 1. Throwing arm — is part of — Trebuchet. A long arm with a sling.
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 — uses — Universal gravitation. The warp threads are tensioned by weights.
5. Step 5. Universal gravitation — is used in — Water tower. Pressure from height.
6. Step 6. Water tower — has part — Centrifugal pump. Filled by pumps.

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