Excavator and archimedes’ screw: what they have in common

1. Step 1. Excavator — has part — Hydraulic cylinder. Hydraulic cylinders move the boom and the bucket.
2. Step 2. Hydraulic cylinder — is part of — Jack. A working cylinder.
3. Step 3. Jack — uses — Screw. A screw jack.
4. Step 4. Screw — is used in — Archimedes’ screw. A rotating helical surface lifts water.

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