Watercraft and electrical telegraph: what they have in common

1. Step 1. Watercraft — includes — Nuclear icebreaker. A vessel.
2. Step 2. Nuclear icebreaker — has part — Nuclear reactor. A reactor plant.
3. Step 3. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
4. Step 4. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.
5. Step 5. Transformer — has part — Copper wire. Windings.
6. Step 6. Copper wire — is part of — Electrical telegraph. Communication lines.

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