The (Landmarks October 17), November 21, 1877, Edison announced the invention of the phonograph.


1877, 11, 21, Edison announced the invention of the phonograph.
phonograph (Phonograph) is a playback device, the sound is stored in the acoustic method in LP (disc) plane carve arc engraved tank. The LP placed on turntable rotation under styluses. Phonograph in 1888 by American inventor Berle that (E.Berliner ,1851-1929) First demonstration, and later gradually replace the drum phonograph, LP can be more convenient to copy a large number of playback time than most cylindrical recording medium length. (L $ dj��.����T)
Comments: great invention. (L $ dj��.c��m)