Helical screw blade and micrometer: what they have in common

1. Step 1. Helical screw blade — is part of — Archimedes’ screw. A spiral that lifts water as it turns.
2. Step 2. Archimedes’ screw — uses — Screw. A rotating helical surface lifts water.
3. Step 3. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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