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stereo records
a stereo record works like this - horizontal motion on a stylus provides a signal for one speaker. vertical motion on a stylus provides a signal for the other speaker.
a mono record - this only has horizontal motion and the signal is sent to both speakers.
how does a record player know if you're playing a mono record, or a stereo record with a silent bit on one channel.
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The description you give for how the channels are split on a stereo record is incorrect. That system was proposed but never adopted; instead the Westrex 45/45 single groove system was utilised.
http://en.wikipedia.org/wiki/Gramophone_record#Stereo_and_beyond
http://en.wikipedia.org/wiki/Gramophone_record#Stereo_and_beyond
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