Electric bell and chisel: what they have in common

1. Step 1. Electric bell — has part — Electromagnet. An electromagnet strikes a small hammer.
2. Step 2. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
3. Step 3. Bubble chamber — has part — Piston. It releases pressure.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.
5. Step 5. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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