Hydraulic cylinder and electrical telegraph: what they have in common

1. Step 1. Hydraulic cylinder — has part — Piston. The piston is moved by liquid.
2. Step 2. Piston — is part of — Bubble chamber. It releases pressure.
3. Step 3. Bubble chamber — has part — Electromagnet. The field bends the tracks.
4. Step 4. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.

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