Tourniquet and GPS (satellite navigation): what they have in common

1. Step 1. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
2. Step 2. Screw thread — is used in — Rifling. Helical grooves.
3. Step 3. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
4. Step 4. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
5. Step 5. Reaction wheel — is part of — Artificial satellite. Attitude control.
6. Step 6. Artificial satellite — is part of — GPS (satellite navigation). A constellation of satellites.

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