Hi:
I'm watching this hour lecture on YouTube by the Naval Postgraduate School (NPS) for information about Helmholtz
Resonators, but recommend it here because there's excellent demonstrations of time related ideas.
Helmholtz Resonator and other Maintained Oscillators
https://youtu.be/y86QhzesYok
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
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