Rifling and heron’s aeolipile: what they have in common

1. Step 1. Rifling — is part of — Revolver. A rifled barrel.
2. Step 2. Revolver — has part — Cartridge. Cartridges.
3. Step 3. Cartridge — is part of — Machine gun. Cartridges in a belt.
4. Step 4. Machine gun — uses — Reaction force. Recoil energy reloads the weapon.
5. Step 5. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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