Posted by Loni Rosser on
URL: https://www.es-forum.com/EMF-Blocking-tp3349069p3355878.html

Wow, mu metal is complicated. I guess this whole illness is complicated.
 
I was in a remote area staying few years ago and they had an old fridge and it did not bother me. But the electricity was not dirty. None of it bothered me up there.
 
Loni


--- On Wed, 9/21/11, S Andreason <[hidden email]> wrote:


From: S Andreason <[hidden email]>
Subject: Re: [eSens] EMF Blocking
To: [hidden email]
Date: Wednesday, September 21, 2011, 7:42 AM


 



Hi,
C.a.b. Johnson wrote:
> piece in front of the refrigerator wide enough to block the magnetic radiation from bending around the back towards the front.
Magnetic fields move in a circular pattern. Toroids actually. Not in a
straight line from the center.
So it is best to avoid calling it a radiation.

> I could buy a new refrigerator for that but I suppose that the new ones are just as bad as the old ones.
>
Not always, but in this case it is probably safer to say they all put
out an unwanted magnetic field, as they all have motors. Except the
amonia-based propane burning models for travel trailers and off grid use.

> So how to go about blocking the Refrigerator with Mu Metal? Do you suggest just leaning a piece up against it and rotating it around to block whereever you might be?
>

It is not that simple. One flat sheet, won't cut off very many of the
circular bands, unless the magnetic field is smaller than the mu-metal
sheet. The magnetic force comes AROUND the (fridge/motor/magnet) from
one pole to the other. For mu-metal to be effective, it needs to
encompass the magnetic field without creasing, or sharp bends. (It must
be kept smooth.)
Then the thickness of the mu-metal will also determine how much of the
field is attenuated. I get about 50% reduction with the 0.004" thick
foil I got wrapped around an AC motor, and in another little project I
made a half cylinder around a transformer. The literature says up to 75%
reduction with one layer.

I still find avoidance is easier.

Stewart








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