Leather seat and lathe: what they have in common

1. Step 1. Leather seat — is part of — Saddle. A leather seat.
2. Step 2. Saddle — is made of — Leather. A saddle is made of leather.
3. Step 3. Leather — is material for — Tourniquet. The strap of a tourniquet is leather.
4. Step 4. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a 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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