Public address system und telescope: was sie gemeinsam haben

1. Schritt 1. Public address system — hat als Teil — Loudspeaker. Loudspeakers.
2. Schritt 2. Loudspeaker — ist Teil von — Telephone. The earpiece reproduces the other person’s voice.
3. Schritt 3. Telephone — entwickelte sich aus — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Schritt 4. Electrical telegraph — entwickelte sich aus — Optical telegraph. The electrical telegraph replaced semaphore lines.
5. Schritt 5. Optical telegraph — nutzt — Telescope. Signals were read through a telescope.

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