Light switch and rock drill: what they have in common

1. Step 1. Light switch — is part of — Electric bell. A button.
2. Step 2. Electric bell — has part — Electromagnet. An electromagnet strikes a small 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 — Rock drill. A percussion piston.

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