High pressure fuel pump and chisel: what they have in common

1. Step 1. High pressure fuel pump — is part of — Diesel engine. It delivers fuel to the injectors.
2. Step 2. Diesel engine — has part — Piston. Pistons move in the cylinders.
3. Step 3. Piston — is part of — Rock drill. A percussion piston.
4. Step 4. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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