Dear Martin, >> I realized today that I only have a very *vague* idea of what is meant by the phrase 'tetrapolar magnet'. It's something that wasn't really totally cleared up for me when I read through IIH. Rawn, is there anything on your website regarding this? I had a look but didn't see it mentioned in a link title. Or does anyone else know of a website maybe which deals with this topic... I did a google search for the term, but with very limited results. << Another name for this is the Quadrapolar Magnet (QPM). That's the term I used in my IIH Commentary. Look in the "Theory" section of my Commentary (p. 34 of ABC). Also, in the Files section of the BardonPraxis homepage, you'll find a .jpg image of the QPM. My best to you, :) Rawn Clark 27 Jan 2003 rawnclark@... rawn@... http://www.ABardonCompanion.com http://groups.yahoo.com/group/BardonPraxis