Trebuchet and steam turbine: what they have in common

1. Step 1. Trebuchet — uses — Counterweight. A falling counterweight swings the throwing arm.
2. Step 2. Counterweight — is used in — Forklift. A counterweight.
3. Step 3. Forklift — has part — Hydraulic cylinder. Lifting the forks.
4. Step 4. Hydraulic cylinder — is part of — Excavator. Hydraulic cylinders move the boom and the bucket.
5. Step 5. Excavator — has part — Boiler. The first excavators were steam-powered.
6. Step 6. Boiler — is part of — Steam turbine. Steam from the boiler.

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