Sunday, March 6, 2011

Phonograph

The phonograph was invented by Thomas Alva Edison in 1877.  It played previously recorded sounds through grooves on a rotating cylinder.  As the cylinder rotated, a needle traces the grooves and vibrates, reproducing sound waves.  The device eventually evolved into the record player, and after that, into the turntable.  All of these devices were used by common people for listening to music.

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