Eddy currents and optical telegraph: what they have in common

1. Step 1. Eddy currents — is used in — Induction hob. The cookware is heated by eddy currents.
2. Step 2. Induction hob — has part — Inductor. A coil under the panel.
3. Step 3. Inductor — has part — Copper wire. A winding.
4. Step 4. Copper wire — is part of — Electrical telegraph. Communication lines.
5. Step 5. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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