Steam locomotive und optical telegraph: was sie gemeinsam haben

1. Schritt 1. Steam locomotive — nutzt — Railway track. It runs on rails.
2. Schritt 2. Railway track — inspirierte — Time zones. Introduced because of railway timetables.
3. Schritt 3. Time zones — nutzt — Electrical telegraph. Synchronizing time by telegraph.
4. Schritt 4. Electrical telegraph — entwickelte sich aus — Optical telegraph. The electrical telegraph replaced semaphore lines.

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