Brille und railway track: was sie gemeinsam haben

1. Schritt 1. Brille — entwickelte sich zu — Telescope. The first telescopes were assembled by spectacle makers.
2. Schritt 2. Telescope — wird verwendet in — Optical telegraph. Signals were read through a telescope.
3. Schritt 3. Optical telegraph — entwickelte sich zu — Electrical telegraph. The electrical telegraph replaced semaphore lines.
4. Schritt 4. Electrical telegraph — wird verwendet in — Time zones. Synchronizing time by telegraph.
5. Schritt 5. Time zones — wurde inspiriert von — Railway track. Introduced because of railway timetables.

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