[Sage]

I have never heard of the "Curry Lines". I understand the point Jeysie is making about the "pendulum effect", and I agree with it. But I don't see what that has to do with dowsing.
Around here, we hire dowsers to find good spots to dig wells. I've seen one work, and the results spoke for themselves: 30 feet down was clear water (on a hilltop, well above the natural water table). I also spoke to the man at some length about dowsing. He said that anyone can learn to do it, but some people were much more naturally adept at it than others. According to him, this is a talent that tends to run in families, and he himself came from a long line of dowsers. He also said that neither of his three sons were interested in carrying on the family business, so it would probably die out with him.