Turbine guide vanes e tunnelling shield: o que têm em comum

1. Passo 1. Turbine guide vanes — faz parte de — Water turbine. Adjustable guide vanes admit the water.
2. Passo 2. Water turbine — evoluiu de — Water wheel. The turbine is a development of the water wheel.
3. Passo 3. Water wheel — faz parte de — Gunpowder mill. The drive.
4. Passo 4. Gunpowder mill — utiliza — Gunpowder. Production.
5. Passo 5. Gunpowder — evoluiu para — Dinamite. A replacement for gunpowder in mining.
6. Passo 6. Dinamite — funciona como — Tunnelling shield. Two ways of driving tunnels — mechanical and explosive.

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