> >The one problem he had that doesn't map is that the downhill flow ended below sealevel, so he had to build a >pumping station to bring it back up - I'm not sure if this situation has an analogue in electronics? Sure. The pump is the battery. In our world, everything happens above ground. Now there is that strange land that has a negative battery, and apparently everything is helium-filled. :) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics