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Recreating the first moments of recorded sound
Dara O Briain and Mark Miodownik use an antique phonograph to record and replay a few sentences of speech. The phonograph was invented in 1877 by Thomas Edison, and was an improvement over previous sound recording devices because it could also play back sounds as well. Mark explains that the machine records by converting the vibrations in the air (sound) to movements in the needle; this then etches a wave pattern onto the wax cylinder. The sound can be replayed when the needle retraces the groove in the wax and the vibrations amplified. Web exclusive outtake from 'Dara O Briain's Science club' on BBC Two in December 2012.
Could be used as a stimulus when describing how sound is the generation, transmission and detection of vibrations, or to illustrate how different devices record and play back sounds. could also be used when discussing analogue signals.
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