Vernier caliper and newcomen engine: what they have in common

1. Step 1. Vernier caliper — evolved into — Micrometer. A more precise instrument.
2. Step 2. Micrometer — uses — Screw. A precise screw with a 0.5 mm pitch.
3. Step 3. Screw — is used in — Jack. A screw jack.
4. Step 4. Jack — has part — Piston pump. A hand plunger pump.
5. Step 5. Piston pump — is part of — Newcomen engine. The beam drove a mine pump.

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