[time-nuts] Whispering Gallery-Mode....??

Poul-Henning Kamp phk at phk.freebsd.dk
Thu Apr 24 15:01:25 EDT 2008

In message <20080424183128.76BE6BE42 at ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes:
>> You start as low as go can and sweep slowly upwards until you suddenly
>> hit a resonance of quite startling intensity. 
>Neat.  Thanks.
>The Exploratorium has a linear version.  It's an amazing toy.  (They call it 
>an exhibit.)
>It's a hollow tube, 3m dia, 20m tall.  Rather than sweep the frequency, they 
>have a xylophone tuned to several resonant frequencies.

I'm not sure that's a whispering gallery effect, the height of the tube allows
the energy to dissipate upwards so there will be very little energy circulating.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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