Strowger switch and freezer: what they have in common

1. Step 1. Strowger switch — has part — Electromagnet. Electromagnetic stepping mechanisms.
2. Step 2. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
3. Step 3. Bubble chamber — uses — Latent heat. A particle leaves a trail of boiling bubbles.
4. Step 4. Latent heat — is used in — Vapour-compression cycle. The evaporation of the refrigerant produces cold.
5. Step 5. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

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