Bubble chamber and chisel: what they have in common

1. Step 1. Bubble chamber — has part — Piston. It releases pressure.
2. Step 2. Piston — is part of — Rock drill. A percussion piston.
3. Step 3. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
4. Step 4. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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