The Phonograph and its Applications - Text 2
The patent application, entitled “Controlling by sound the transmission of electric current and reproduction sounds at a distance,” was filed in the United States on 24 December 1877 and granted under the number 200,521 on 19 February 1878. Soon after it was filed, on 15 January 1878, this patent was completed with a certificate of addition, in which an exact description of the device was given and in which the term “phonograph” appears. The new improved phonograph was released at the end of that same year; its structure now resembled the most precise scientific instruments. Several models of the Edison phonograph were created and distributed around the world,[2] including the famous Phonograph Class M, which was unique in making group listening possible. In Europe and especially in France, it was not commercially distributed before 1890, but the French public could admire it at the 1889 World’s Fair.
