Turbine guide vanes and tunnelling shield: what they have in common

1. Step 1. Turbine guide vanes — is part of — Water turbine. Adjustable guide vanes admit the water.
2. Step 2. Water turbine — evolved from — Water wheel. The turbine is a development of the water wheel.
3. Step 3. Water wheel — is part of — Gunpowder mill. The drive.
4. Step 4. Gunpowder mill — uses — Gunpowder. Production.
5. Step 5. Gunpowder — evolved into — Dynamite. A replacement for gunpowder in mining.
6. Step 6. Dynamite — works like — Tunnelling shield. Two ways of driving tunnels — mechanical and explosive.

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