Interrupter contact and tunnelling shield: what they have in common

1. Step 1. Interrupter contact — is part of — School bell. It breaks the circuit, making the armature vibrate.
2. Step 2. School bell — has part — Electromagnet. An electromagnet strikes the hammer.
3. Step 3. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
4. Step 4. Bubble chamber — has part — Piston. It releases pressure.
5. Step 5. Piston — is part of — Hydraulic cylinder. The piston is moved by liquid.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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