Precast concrete and archimedes’ screw: what they have in common

1. Step 1. Precast concrete — is material for — Panel building. Panels.
2. Step 2. Panel building — has part — Elevator. Lifts.
3. Step 3. Elevator — uses — Counterweight. A counterweight balances the car.
4. Step 4. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.
5. Step 5. Shaduf — is used in — Irrigation. The shaduf fed water into the canals.
6. Step 6. Irrigation — uses — Archimedes’ screw. The Archimedes’ screw lifted water for irrigation.

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