Wagonway e radio: o que têm em comum

1. Passo 1. Wagonway — evoluiu para — Railway track. Cast-iron and steel rails replaced wooden ones.
2. Passo 2. Railway track — inspirou — Time zones. Introduced because of railway timetables.
3. Passo 3. Time zones — utiliza — Electrical telegraph. Synchronizing time by telegraph.
4. Passo 4. Electrical telegraph — utiliza — Morse code. Morse encoding.
5. Passo 5. Morse code — é utilizado em — Radio. The first radio transmissions were in Morse code.

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