Re: Y chromosome, dropped magnet, S pole in Canada, Pi problem: was: Re: Appropriate for Gen Phys? was: comprehending electric/magnetic interactions

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 12:14 AM 7/6/2003 -0700, Bernard Celyet, you wrote:

>  ...one may make a
> magnet by hammering a non magnetized * nail while oriented N-S.  I also
> read that banging magnets decreased their strength. ...


...and then there's the celebrated experimental protocol which
marks a patch of rock outcrop with a compass direction,
drills out a rock core an inch or two  diameter by a few inches long,
and  subjects it to a micromagnetometer measurement, with thermal
cycling, to ascertain its remanent direction of magnetization,
leading to interesting theories of geomagnetic reversals and
paleomagnetic field maps.

Brian Whatcott     Altus OK