Plasma torch and rock drill: what they have in common

1. Step 1. Plasma torch — is part of — Plasma cutting. A burner with an electrode and a nozzle.
2. Step 2. Plasma cutting — uses — Electric arc. An arc.
3. Step 3. Electric arc — is used in — Arc lamp. An arc.
4. Step 4. Arc lamp — is part of — Street light. The first electric street lights were arc lamps (the “Yablochkov candle”, 1878).
5. Step 5. Street light — is part of — Tunnel. Lighting.
6. Step 6. Tunnel — uses — Rock drill. Driving the Mont Cenis tunnel.

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