Screw casing tube and lathe: what they have in common

1. Step 1. Screw casing tube — is part of — Archimedes’ screw. It wraps around the blade.
2. Step 2. Archimedes’ screw — uses — Screw. A rotating helical surface lifts water.
3. Step 3. Screw — is used in — Lead screw. A lead screw is a screw.
4. Step 4. Lead screw — is part of — Screw-cutting lathe. The lead screw moves the cutting tool.
5. Step 5. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.

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