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Ideally, the surrounding Faraday cage is a perfect conductor.  Thin
aluminum foil might have sufficient electrical resistance to be an
effective shield.  I believe it is also better if the Faraday cage is
externally grounded.

Don Seltzer

On Tue, Mar 10, 2015 at 3:41 PM, Bob Goethe  wrote:
>>>As to Faraday cages: I did an experiment with one of our cell phones. I
>>> wrapped it up in heavy aluminum foil, folded all the edges, and placed it in
>>> an all metal eyeglass case. My mate then dialed the phone and behold- it
>>> rang. I figure if a mobile phone signal can transmit through that set up an
>>> EMP would have no trouble at all. <<
>
> Try this again, but this time put an electrical-insulator layer around the
> cellphone so that the metal can't touch it at all.  I'll do the same thing
> sometime in the next 24 hours.
>
> We can both adopt the motto of the Royal Society:  Nullius in verba (Latin
> for "on the word of no one" or "Take nobody's word for it").
>
> I'll be disturbed if this whole Faraday cage thing doesn't work.
>
> Bob
>
> 

   

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