Vacuum pump and lathe: what they have in common

1. Step 1. Vacuum pump — has part — Check valve. Valves stop air from flowing back.
2. Step 2. Check valve — is part of — Jack. Check valves.
3. Step 3. Jack — uses — Screw. A screw jack.
4. Step 4. Screw — evolved into — Screw thread. A thread is an application of the screw.
5. Step 5. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
6. Step 6. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.

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