The half of this silly ol' globe that the US and europe sits on in the south
pole of a magnet, not south as defined by Rawls and Davis but south as
defined by every loop of wire and every physicist.
Further more the lines of magnetic force are drawn and have been drawn as
issuing out on the north pole of a magnet, or clockwise around a negative
charge shooting out of the screen you are reading this on, and have been
drawn this way for a very long time. (long before 1949)
Next we can debate which way the current is in wires! (which is opposite to
the direction electrons flow FYI)
I don't care if it makes no sense that the geographic north pole of the
earth is the south pole of a magnet, Or that we say the current in the wire
moves from the positive to the negative, because though it may be annoying
we can't just reverse the usage. (everyone would need to reverse their
usage, otherwise it just creates further confusion)
So the geographic north pole of the earth is the south pole of a magnet, and
the geographic south pole of the earth is the north pole of a magnet, What
Rawls and Davis refer to as the north pole of a magnet everyone else calls a
south pole and visa versa, in other words they are going by geographic
naming of the poles.
And no the problem was not started by three professors, they got it right,
the problem started because before anyone knew too much about how magnets
worked they named the pole which turned north the north seeking pole,
however the seeking part was left off (slackness) and it became known as the
north pole of a magnet, but logic says that if we know opposites attract and
what we call the north pole of a magnet points to north geographic pole then
one of those norths is really a south, but rather than switching the names
we call the poles of a magnet they called the north (geographic) pole of the
earth the south pole of a magnet. (which is no problem as we just put
"geographic" in when we are not talking about magnets)
John Berry
THE TROLL wrote:
> Hi Folks,
>
> 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.
>
> --
> E-mail to: broompilot@juno.com (no attachments)
>
> Otherwise: broompilot@netzero.net
>
> Fax to: 1-253-681-1133
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