Caliper jaws and archimedes’ screw: what they have in common

1. Step 1. Caliper jaws — is part of — Vernier caliper. Measuring jaws.
2. Step 2. Vernier caliper — evolved into — Micrometer. A more precise instrument.
3. Step 3. Micrometer — uses — Screw. A precise screw with a 0.5 mm pitch.
4. Step 4. Screw — is used in — Archimedes’ screw. A rotating helical surface lifts water.

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