Arma de fogo e hydraulic press: o que têm em comum

1. Passo 1. Arma de fogo — utiliza — Gunpowder. Powder gases.
2. Passo 2. Gunpowder — evoluiu para — Dinamite. A replacement for gunpowder in mining.
3. Passo 3. Dinamite — funciona como — Tunnelling shield. Two ways of driving tunnels — mechanical and explosive.
4. Passo 4. Tunnelling shield — utiliza — Hydraulic cylinder. The shield was pushed forward by jacks.
5. Passo 5. Hydraulic cylinder — faz parte de — Hydraulic press. Two cylinders of different diameters.

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