The sound waves form a cone, could any other types do this as well?
-----Original Message-----
From: Terry Bastian <tbastian@dmv.com>
To: keelynet@DallasTexas.net <keelynet@DallasTexas.net>
Date: Friday, September 11, 1998 11:56 AM
Subject: Sonic info & links
>
>
>
>FireOrgan
>http://www.exploratorium.edu/AIDS/trimpin.state.html
>http://www.islandnet.com/~ianc/dm/16/162.html
>
>Shuman Resonance. This is the frequency at which the Earth's magnetic
>field resonates when excited by a powerful enough force. The first one I
>learned about was lightning. I then looked further into this phenomenon
>and found that tornadoes also cause this resonance to be excited, but
>surprisingly enough in the air. Just before a tornado forms an 8Hz tone
>is heard. This was discovered by a group of geophysicists who were using
>listening devices for detecting, of all things, earthquakes, which also
>happen to cause a resonance effect of 8Hz, both electromagnetically and
>acoustically. Volcanoes also tend to excite this resonance before
>erupting.
>
>
>Physics of Open Ended Tubes
>http://www.geocities.com/Vienna/3941/oetubes.html
>
>Physics of Closed End Tubes
>http://www.geocities.com/Vienna/3941/closedend.html
>
>
>
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