Trampoline and archimedes’ screw: what they have in common

1. Step 1. Trampoline — is made of — Cotton. The bed is canvas.
2. Step 2. Cotton — is used in — Cotton gin. Cleaning cotton.
3. Step 3. Cotton gin — has part — Crank. The drum was turned by a handle.
4. Step 4. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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