Pantograph e optical telegraph: o que têm em comum

1. Passo 1. Pantograph — faz parte de — High-speed train. A current collector.
2. Passo 2. High-speed train — funciona como — Maglev. The same task without contact between wheel and rail.
3. Passo 3. Maglev — utiliza — Eletromagnetismo. Electromagnets hold and move the train.
4. Passo 4. Eletromagnetismo — é utilizado em — Electrical telegraph. A telegraph receiver is an electromagnet that attracts an armature.
5. Passo 5. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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