The book "Some Important Operations in Bee Management" by T.S.K. and M.P. Johansson published by the IBRA in 1978 mentions pouring dry sugar on newspaper, sitting on topbars (p.87).
I believe "dickm" was the first to use the term "MountainCamp Method" in this thread in 2004: http://www.beesource.com/forums/showthread.php?t=197517
If the technique is being debated/criticized, perhaps "MountainCamp" would prefer that we call it the "Johansson Method".