On this day, 148 years ago, on November 21, 1877 (October 17, 1877 in the lunar calendar), Edison announced the invention of the phonograph. Edison phonograph On November 21, 1877, Edison announced the invention of the phonograph. A phonograph is a playback device in which sound is stored in an arc-shaped groove acoustically carved on the plane of a record (disc). The record is placed on a turntable and rotated under the needle. The phonograph was first demonstrated in 1888 by the American inventor E.Berliner (1851-1929), and later gradually replaced the barrel phonograph because records can be easily reproduced in large quantities and the playback time is longer than most barrel recording media. Comment: Great invention.