Just a small thought here - why wouldn't they use two metal plates and use = the sea as the battery? Unless the load would be too great of course. >>> dbutler@IMETRIX.COM 03/01/02 10:54AM >>> Somewhere I have some data taken by the Woods Hole Oceanographic = Inststute for instruments that would run off batteries for several years = on the bottom of the ocean, Sherpa Doug -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body