[TheForge] boing boing pond.

[Bruce .]

Well, ice melts on compression, so phase change is a possibility.  Ice
skates reputedly melt the ice directly beneath their blades, so why not
skipped stones?

Actually, I rather suspect that there was air beneath this ice, as there
often is, adding a resonance chamber to the effect.  The nature of the
resonance makes a big difference to the sound we hear.  The sound of an
organ pipe starts with a whistle -- air split by a blade -- and only the
length of the pipe turns it into the sound we hear.

Meanwhile the shape of the bore matters too.  It seems that the conical
bore of a clarinet results in cancellation of the even overtones, which in
turn gives rise to a square waveform -- beautiful to listen to.

So someone with a physics and acoustics background might analyze what it
would take to produce a chirp naturally (birds do it, after all), then
relate it back to an ice layer.

Bruce
NJ

On Wed, Oct 22, 2014 at 5:36 PM, jerry Frost <akfrosty at mtaonline.net> wrote:

> Chirp is a much better term, consider it adopted thank you. As interesting
> and weird as water is, ice is even weirder. I wouldn't be surprised if the
> chirping is the sound of an impact phase change resonating through a
> damping
> media.  Maybe nuclei are excited by romantic radio waves. <grin> I'm sure
> something can be learned from the effect but is there practical uses?
> Beyond
> more knowledge that is.
>
> I know about how easily X-rays can be generated, unwrapping Saran wrap will
> do it too. I think the Scotch tape method was discovered first, I don't
> know. The Saran wrap method was used in an episode of the TV show "Bones"
> to
> x-ray a piece of evidence during a power outage. That's only to show how
> common the knowledge is if Hollywood is using it accurately. Then again
> Kathy Reichs the writer director, creator of Bone is herself a forensic
> pathologist and insists on a reasonable validity to the science in the
> show.
>
> The world is so full of cool stuff a boy has to wonder what the rest of the
> multiverse has to marvel about.
>
> Jer
> -----Original Message-----
> From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of
> Bruce
> .
> Sent: Tuesday, October 21, 2014 4:41 AM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] boing boing pond.
>
> I saw that.  The sound is indeed cool.  To my ear, it sounds like a
> "chirp",
> which is a scientific term, believe it or not, for a waveform that (you
> guessed it!) sounds like a chirp!
> http://en.wikipedia.org/wiki/Chirp
> I learned about this waveform from a discussion (?) of Fourier-transform
> NMR, in which the radio signal exciting the nuclei may be delivered as a
> chirp in order to scan the wavelength spectrum.
> Now, this makes me wonder WHY a chirp is produced by skipping rocks, and
> whether anything can be learned from it.  I( get on these rants every now
> and then since somebody discovered you could produce X-rays using scotch
> tape!  http://en.wikipedia.org/wiki/Scotch_Tape#X-rays)
>
> Bruce
> NJ
>
> On Tue, Oct 21, 2014 at 2:15 AM, jerry Frost <akfrosty at mtaonline.net>
> wrote:
>
> > What to do with your fish pond when it freezes over.
> >
> > Jer
> >
> > http://www.ktuu.com/news/news/rock-skipper-discovers-unique-noise/2915
> > 8406
> >
>
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