Die Erfindung des Telefons
Erste Denkansätze zu einem Telefon gab es bereits um 1854 als von Seiten des Militärs der Wunsch nach schnelleren Kommunikationsmitteln aufkam und der Pariser Telegrafenbeamte Charles Bourseul (1829-1912) ein Referat über mögliche Techniken der elektrischen Sprachübertragung verfasste. Er schlug eine bewegliche Platte vor die abwechselnd einen Stromkreis ... » zum Artikel
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