Rubber band strap and parachute: what they have in common

1. Step 1. Rubber band strap — is part of — Tourniquet. An elastic band.
2. Step 2. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
3. Step 3. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
4. Step 4. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.
5. Step 5. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
6. Step 6. Rope — is part of — Parachute. The lines are ropes.

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