On a colloidal silver list, we were talking about making CS with
structured water and one of the folks said he structures the CS after
making it by placing the bottle on the north side of a 3000 Gauss disk
magnet for some number of hours (I forget
how many).
Since some folks are inclined to think that north is really south and
south is really north (we've been through that already on this list) I
asked him how the north-seeking end of
a compass needle reacts to the north side of his magnet. Is it
attracted or repelled?
He said it was *attracted*, of course. I mentioned the confusion and
sent him to:
http://www.ngdc.noaa.gov/seg/potfld/faqgeom.html
Which offered the picture:
http://www.ngdc.noaa.gov/seg/potfld/img/faqpole.gif
I told him it made no sense to me and I have not heard any explanation
for this idiocy.
The following is his reply.
David
---------------------------------------------
Hi David and listers,
No problem. Many persons have seen the picture and taken its meaning
OUT OF CONTEXT. Everyone in the magnetic industry and science does it
the same way as I said in the previous post. :-)
Back in 1949 three professors were studying the earths magnetic field
for the defense department. Names were Sears of Dartmouth College,
Zemansky of University of New York, and Young of Carnegie-Mellon
University. I was working in the same area with detection of magnetic
anomalies at the time. Anti-sub stuff.
These men were doing detailed studies of the earths field and to help
their conceptualization drew the crust and mantle of the earth as a
large circle with a north field at the top (north pole) and then drew a
smaller circle inside to represent the CORE of the earth. In the core
they assumed (we don`t really know) that a dipole magnet could exist
with its south pole lined up to the north pole of the mantel, and the
CORE dipole north pole lined up with the mantel south pole. Look
carefully at the picture and you will see that the CORE magnet is drawn
inside the core. The core magnet will have its poles opposing the mantel
poles. This picture, looked at out of context, has confused many
persons. The picture first appeared in the publication "University
Physics", by Addison Wesley Publishing Co., an international company in
USA, London, Amsterdam, Ontario, Sydney and others. That was in 1949 on
page 602 under a discussion of the earths field. The book is right here
in front of me.
Remember the crust/mantel north field is at the north pole and the core
south pole is right under it. Makes for a continuous magnetic loop of
"mantel north to Core south--through the core to core north to mantel
south-- then through space back to the mantel north.
The question often comes up, why did they do this?
In order to account for the fact that from the equator to the poles the
dip angle slowly begins to point down until it is vertical at the poles
they had to depict an opposing dipole magnet in the core of the earth.
The crust/mantel field alone could not account for the gradual dip as
lattitude increased. All a matter of vector analyses and great circle
navigation requirements, ( a bunch of math stuff).
As for why the picture keeps showing up out of context , the writers
don`t know their subject and just keep copying each others wrong
stuff,and it goes round and round.
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