Electric bell and oil well: 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 — Diesel engine. Pistons move in the cylinders.
5. Step 5. Diesel engine — is part of — Drilling rig. The drive.
6. Step 6. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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