Albert Einstein was a recreational dowser. Sadly he never took the time to investigate it scientifically (I think he liked the mystery of it, to be honest) so there's no "Einstein's Theory of Dowsing" to consult.

Just thought I'd share that bit of trivia.

< I am currently doing a little paper on the mathematics behind Lethbridge's long pendulum, something he was never able to really undertake. >

I'd be most interested in reading that FW. Any chance y' could email us a copy when you've finished - wouldn't mind going thru what you find.