1in the summer of 877, Edison put forward the idea of a machine with recording and playback functions. 1877 65438+in February, Edison further put forward the specific structure of the machine after repeated ideas, and drew it into drawings, which were made by skilled craftsmen. A craftsman named Wuji spent 30 hours making the drawings of Edison's phonograph into an actual machine. However, the first phonograph had many defects, and the sound was so weak that it was almost impossible to distinguish the sound it made. So Edison kept improving the phonograph until 12 years later, 1898 Edison invented a perfect phonograph and won a gold medal.
Although it is copied, it seems to be true.