"Patrick Turner"
Hardly anyone understands magnetism.
** An invention of the devil for sure ....
For those inclined to read more, you could do well to read up at
http://www.ndt-ed.org/EducationResou.../Magnetism.htm
There is application of ideas to MPI, magnetic particle inspection of
many things to detect cracks or metal faults.
But basics about magnetics is well explained along with units used.
** The various Wikis on magnetism and electromagnetism are rather more
informative and have better diagrams.
http://en.wikipedia.org/wiki/Magnetism
The first dude to ever wind some copper wire around an iron nail was really
onto something....
..... Phil