On This Day in Telephone History December 29TH 1874 Elisha Gray demonstrates his musical tones device, a.k.a. Electro-Harmonic Telegraph, and transmits "familiar melodies through telegraph wire" at the Presbyterian Church in Highland Park, Illinois.

On This Day in Telephone History December 29TH 1874

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On This Day in Telephone History December 29TH 1874 Elisha Gray demonstrates his musical tones device, a.k.a. Electro-Harmonic Telegraph, and transmits “familiar melodies through telegraph wire” at the Presbyterian Church in Highland Park, Illinois.