Football and lathe: what they have in common

1. Step 1. Football — is made of — Leather. The casing.
2. Step 2. Leather — is material for — Tourniquet. The strap of a tourniquet is leather.
3. Step 3. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
4. Step 4. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
5. Step 5. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.

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