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Thomas Alva Edison (1847 - 1931)
Inventor Thomas Alva Edison profoundly influenced modern life through inventions such as the incandescent light bulb, the phonograph, and the motion picture camera. During his lifetime, he acquired 1,093 patents, and marketed many of his inventions to the public.
A brief biography of Edison is featured here, along with articles from journals of his day in which he offered his views on music, films, inventions, and other topics. Famous for his motion picture and recorded sound inventions, Edison himself appears here in a film (A Day with Thomas A. Edison) and on a disc recording (Let Us Not Forget).
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The first great invention developed by Edison in Menlo Park was the tin foil phonograph. While working to improve the efficiency of a telegraph transmitter, he noted that the tape of the machine gave off a noise resembling spoken words when played at a high speed. This caused him to wonder if he could record a telephone message. He began experimenting with the diaphragm of a telephone receiver by attaching a needle to it. He reasoned that the needle could prick paper tape to record a message. His experiments led him to try a stylus on a tinfoil cylinder, which, to his great surprise, played back the short message he recorded, "Mary had a little lamb.
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