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Phonograph: Inventions
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The immense success of the phonograph led to demands for improved sound. About 1920, the old mechanical process began to be replaced by electrical recording and reproduction, in which the vibrations of the phonograph needle were amplified by electromagnetic devices instead of a horn. The 78-rpm records continued to be used... until the invention of the first fully practical long-playing record about 1948. For the recent development of the phonograph and stereophonic sound, see Sound Recording and Reproduction.
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Although the phonograph was an original invention, it did not rise out of a vacuum It was the son of a marriage between the telephone and the telegraph. These technologies provided both the need for the phonograph and the means by which to produce it.
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Thomas A. Edison, one of the outstanding geniuses in the history of technology, received patent no. 200,521 for a phonograph on February 19, 1878. This patent is just one of the more than one thousand Edison was granted for his inventions.
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