Elisha Gray and "The Musical Telegraph"(1876) "Gray accidentally discovered that he could control sound from a self vibrating electromagnetic circuit and in doing so invented a basic single note oscillator. The 'Musical Telegraph' used steel reeds whose oscillations were created and transmitted , over a telephone line, by electromagnets. Gray also built a simple loudspeaker device in later models consisting of a vibrating diaphragm in a magnetic field to make the oscillator audible." http://120years.net/machines/telegraph/index.html# |
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