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The Graphophone was the name and trademark of an improved version of the phonograph. It was invented at the Volta Laboratory established by Alexander Graham Bell in Washington, D.C., United States. Its trademark usage was acquired successively by the Volta Graphophone Company, then the American Graphophone Company, the North American Phonograph Company, and finally by the Columbia Phonograph Company (later to become Columbia Records), all of which either produced or sold Graphophones. == Research and development == It took five years of research under the directorship of Charles Sumner Tainter and Chichester Bell at the Volta Laboratory to develop and distinguish their machine from Thomas Edison's phonograph. Among their innovations, the researchers experimented with lateral recording techniques as early as 1881. Contrary to the vertically-cut grooves of Edison phonographs,〔Newville, Leslie J. (Development Of The Phonograph At Alexander Graham Bell's Volta Laboratory ), United States National Museum Bulletin, Smithsonian Institution and the Museum of History and Technology, Washington, D.C., 1959, No. 218, Paper 5, pp.69-79. Retrieved from Gutenberg.org.〕〔Tainter, Charles Sumner. (Recording Technology History: Charles Sumner Tainter Home Notes ), History Department of, University of San Diego. Retrieved from University of San Diego History Department website December 19, 2009〕 the lateral recording method used a cutting stylus that moved from side to side in a "zig zag" pattern across the record. While cylinder phonographs never employed the lateral cutting process commercially, this was later to become the primary method of phonograph disc recording. Bell and Tainter also developed wax-coated cardboard cylinders for their record cylinders, instead of Edison's cast iron cylinder which was covered with a removable film of tinfoil (the actual recording medium) which was prone to damage during installation or removal.〔 Tainter received a separate patent for a tube assembly machine to automatically produce the coiled cardboard tubes which served as the foundation for the wax cylinder records. The shift from tinfoil to wax resulted in increased sound fidelity as well as record longevity. Besides being far easier to handle, the wax recording medium also allowed for lengthier recordings and created superior playback quality.〔Library and Archives Canada. (The Virtual Gramophone: Canadian Historical Sound Recordings: Early Sound Recording and the Invention of the Gramophone ), Library and Archives Canada website, Ottawa. Retrieved May 24, 2014.〕 Additionally the Graphophones initially deployed foot treadles to rotate the recordings, then wind-up clockwork drive mechanisms, and finally migrated to electric motors, instead of the manual crank that was used on Edison's phonograph.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「graphophone」の詳細全文を読む スポンサード リンク
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