Here is a great URL on using swept magnetic fields to cool;
http://www.sciencenews.org/sn_arc98/3_28_98/fob3.htm
-- Jerry W. Decker / jdecker@keelynet.com http://keelynet.com / "From an Art to a Science" Voice : (214) 324-8741 / FAX : (214) 324-3501 KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187