There is a lot that needs to be said here, many corrections. First off the most blatant one is the phony L-rods frame claims. In order to prove anything with that contraption, you would somehow need to have both L-rods perfectly aligned (front and back, and side to side) and have perfect equal rotating resistance (amount of friction). That's never going to happen.
Yes. After I told Art that that I didn't see any way someone could cheat a dowsing effect and cross rods with that setup, It occurred to me that you easily could...by slightly tilting the frame to your front and allowing the momentum of the rods to swing themselves across each other. Again, the isomotor effect can take place: giving you exactly what you want without you knowing it. Isomotor effect is an undeniable, proven effect and can certainly explain many dowsing claims.
As I said in my first post to this thread, I am a skeptic, not an absolute disbeliever. But I have a hierarchy of standards. Again as I said, Occam's Razor should be respected.
In other words,
IF dowsing works (which has in no way been scientifically proven), it could be due to any number of natural phenomena- magnetism, gravitational variation, whatever. If there's a true dowsing effect and it's caused by natural means, it should be as repeatable and unquestionable as the effect your metal detector has on a coin. Yet the fact that we continue to have such discussion on dowsing on this thread proves that dowsing is still a pseudoscience that has not proven itself. Those who believe find an effect, those who don't, don't.
But when it comes to "map dowsing" I stand with Gold Maven. There is nothing on that piece of paper that could possibly have any influence on a rod or a crystal, other than the mind of the person holding it. And the human mind is a malleable thing, easily led to wrong conclusions.
Again, as a skeptic, I won't say anything is outright false without outright proof, but for anyone to go from the potential effect of real world dowsing to the derivative practice of map dowsing, is a person willing to pass a threshold of proof that, in my opinion, goes from the sketchy to the ridiculous.