Cutting edge ring und heron’s aeolipile: was sie gemeinsam haben
- Schritt 1. Cutting edge ring — ist Teil von — Tunnelling shield. The cutting edge of the shield.
- Schritt 2. Tunnelling shield — funktioniert wie — Dynamit. Two ways of driving tunnels — mechanical and explosive.
- Schritt 3. Dynamit — entwickelte sich aus — Gunpowder. A replacement for gunpowder in mining.
- Schritt 4. Gunpowder — wird verwendet in — Rocket. The first rockets were powered by gunpowder.
- Schritt 5. Rocket — nutzt — Reaction force. A rocket moves by reaction force.
- Schritt 6. Reaction force — wird verwendet in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.