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| CED in the History of Media Technology | ||||||||||||||
Edison introduced Blue Amberol cylinders in 1912 that had better sound than discs when played with the recommended diamond stylus, but he hedged his bets by introducing Diamond Disc records in 1913, that also used the diamond stylus. These discs were made of a plastic called Condensite and were about 0.25 inches thick. After this the disc gained increasing popularity over the cylinder, until the cylinder finally died in 1925 when superior Orthophonic phonographs using electrically recorded discs became available.