Klarinet Archive - Posting 000130.txt from 2006/02

From: charette@-----.org
Subj: [kl] Re: Air resonance in a plastic bottle
Date: Fri, 10 Feb 2006 09:58:37 -0500

From: "Lacy, Edwin" <el2@-----.edu>
>
> Some months ago, someone posted a message on this list in which they
> mentioned a mysterious acoustical phenomenon. The message mentioned
> that they had blown across the top of a plastic bottle and noted the
> pitch that resulted.=A0 Then, they squeezed the bottle, presumably
> reducing the interior volume, but were surprised that the pitch fell
> rather than rising, as might be intuitively expected.
>
> I mentioned this to Dr. Darrell Megli, friend and colleague who is a
> physicist, acoustician, and enthusiastic amateur musician.=A0 I knew
> that he would find this problem to be fascinating, and as a person who
> is ready to research such problems without much provocation, he would
> probably get to work to try to find out what was causing this anomalous
> result. He has just sent me a report on his experiment. The report
> is too long to send to the list, as it contains images, and therefore
> "mime content." I would be glad to send it as an e-mail attachment to
> anyone who may be interested. Just reply to me individually rather than
> to the list:

Thank you, Dr. Lacy, for sending me the report and please thank Dr. Megli
for graciously allowed it to be posted on the woodwind.org Web site. It's
been converted to PDF for easy distribution and printing:

http://www.woodwind.org/clarinet/Misc/resonance.pdf

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