We Had No Idea You Could Make An Audio Recording Just Using A Cup - Retro Phonograph Tech In Action

See We Had No Idea You Could Make An Audio Recording Just Using A Cup - Digg

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Apparently, this setup is reminiscent of the way phonograph cylinders work.

source https://gadgeteer.co.za/we-had-no-idea-you-could-make-audio-recording-just-using-cup-retro-phonograph-tech-action