Torsion bar suspension and shaduf: what they have in common

1. Step 1. Torsion bar suspension — uses — Elasticity. It works in torsion.
2. Step 2. Elasticity — is used in — Catapult. A torsion catapult stored energy in twisted skeins.
3. Step 3. Catapult — evolved into — Trebuchet. The trebuchet replaced torsion engines as a more powerful siege machine.
4. Step 4. Trebuchet — uses — Counterweight. A falling counterweight swings the throwing arm.
5. Step 5. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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