Cutting edge ring e heron’s aeolipile: o que têm em comum

1. Passo 1. Cutting edge ring — faz parte de — Tunnelling shield. The cutting edge of the shield.
2. Passo 2. Tunnelling shield — funciona como — Dinamite. Two ways of driving tunnels — mechanical and explosive.
3. Passo 3. Dinamite — evoluiu de — Gunpowder. A replacement for gunpowder in mining.
4. Passo 4. Gunpowder — é utilizado em — Rocket. The first rockets were powered by gunpowder.
5. Passo 5. Rocket — utiliza — Reaction force. A rocket moves by reaction force.
6. Passo 6. Reaction force — é utilizado em — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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