Re: Breaking glass with sound

[Bob Muir <muirrob@UNCG.EDU>]

On Mon, 24 May 1999, Ron Ebert wrote:

> At 10:35 AM 5/24/99 -0400, Gary Hemminger wrote:
> > > I had some students try this a few years ago. They measured the resonant
> > > frequency of the glass and then subjected it to a loud sound at that
> > > frequency. The video showed it shattering. Only later I learned that after
> > > many tries they gave up and shot the glass with a BB gun. It still looked
> > > good.
> >
> > According to my accoustics professor,  Cyril Harris,  (the designer
> > of the renovated Avery Fischer hall at Lincoln Center),  the trick is
> > to make a small nick in the lip of the glass,  and to use fine
> > crystal.
>
> We use an oscillator, amplifier and speaker driver. No pre-demo "cheating"
> is necesssary. Our success rate is 100%. See
> http://phyld.ucr.edu/Sound%20&%20Wave%20Motion%201/S-118G.htm for details.
>
>
> Ron Ebert

Ron,
Thanks for the url.  Will you give us a description of the chamber and the
purpose of the copper pipe including dimensions of the speaker and pipe
(I'm assuming the pipe is a conduit for the sound from the speaker)?

What is the size and power rating of the speaker?

bob

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