Natural Science Forum / Physics / Acoustics / June 2005

Does anyone know where I can find the calculation method for a
single-number rating of sound isolation of building partitions, similar
to STC or OITC, called "EWR" (External Wall Rating)?  This is
apparently a rating developed by Wyle Laboratories, but I cannot find

There are particularly disturbing web sites concerning the use of
electromagnetic weapons at these addresses: Electromagnetic Weapons and Mind
Control: from CNN'S Special Assignment, about 1985, at
http://www.mindcontrolforums.com/cnn-mc.htm ,by Chuck DeCaro, CNN Special

I see some materials advertised that claim an NRC of greater than 1.0, and
am wondering how this could happen?  Thanks.

Are they good?
Wich to choose!
Thanks!!

I'm a student looking for help on some acoustic issues.
i'm currently designing recycled paper acoustic wall tiles.
My aim is to provide a solution for sound correction, that also
function as soundproofer.

Wanted: for 1/2" microphone, flexible adaptor or small right angle (approx.)
adaptor.   If you're interested in selling anything like this, please email
direct to adaptor (at) tonywoolf.co.uk.
TW