Visualizing sound waves with a Rubens tube.
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Previously:
https://www.homemadetools.net/forum/...266#post214885
https://www.homemadetools.net/forum/...733#post225958
https://www.homemadetools.net/forum/...374#post192625
https://www.homemadetools.net/forum/...093#post221343
https://www.homemadetools.net/forum/...489#post215616
