I added several new pictures to the site. One shows how motor driven threaded rod moves a captive nut on the stationary disks. The new picture is at: http://www.geocities-dot-com:80/CapeCanaveral/Launchpad/6827/Oct1002.htm The moving electrodes are welding rod but the stationary ones 1 in. disks of tungston cut in half and silver soldered to brass acorn nuts. There is a new picture of these also. Richard Silvera