Possibly electroplating. http://en.wikipedia.org/wiki/Baghdad_Battery But withou...

		tisme on Oct 26, 2012 \| parent \| context \| favorite \| on: 80 terabytes of archived web crawl data available ... Possibly electroplating. http://en.wikipedia.org/wiki/Baghdad_Battery But without positive proof of a series connection I don't see how that is a sustainable theory. Wiring is a necessity.

Neat, thanks -- I'd forgotten about that.