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This device used a horn to direct sound toward a flexible diaphragm placed at the small end. Attached to the diaphragm was a stylus and lever assembly that allowed the point to scratch out a line on a rotating cylinder beneath it.
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Alexander Graham Bell experimented with a Phonautograph in 1874, shortly before Edison’s invention.
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The phonograph was developed as a result of Thomas Edison's work on two other inventions, the telegraph and the telephone.
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Essentially an improved phonograph, the new recorder stimulated Edison to return to his invention, and the result in 1886 was the improved phonograph.
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Using a flat disk record instead of a cylinder, was available in Europe in 1889, and was introduced in the US in 1894 after the inventor’s move to Philadelphia.
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Magnetic recording, which is today used for video and audio tape, was first introduced around 1899-1900 by the Danish inventor Valdemar Poulsen.
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In this type of recorder, electrical signals are delivered to the electromagnetic cutting head, which is carried in a lathe-like mechanism
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Western Electric’s recorder used electronic amplifiers to drive anelectromagnetic cutting head
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This AEG magnetophon was one of several versions of the technology developed in Germany between the early 1930s and 1945.
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A famous demonstration given in 1948 or 1949 by Jack Mullin featured the new Ampex tape recorder.
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The first stereo recordings available to the public were in the form of reel-to-reel tape.
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Introduced by Phillips in Europe and Norelco in the U.S.
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