2 Jan 1875 Jahr - TELEPHONE'S IDEA SET ON BELL'S MIND
Beschreibung:
By June 1875 the goal of creating a device that would transmit speech electrically was about to be realized. They had proven that different tones would vary the strength of an electric current in a wire. To achieve success, they, therefore, needed only to build a working transmitter with a membrane capable of varying electronic currents and a receiver that would reproduce these variations in audible frequencies.
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