Road roller and archimedes’ screw: what they have in common

1. Step 1. Road roller — evolved from — Watt steam engine. The first rollers were steam-driven.
2. Step 2. Watt steam engine — has part — Crank. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).
3. Step 3. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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