the success of the process is evinced by the number of claimants as "discoverers" of flotation. in 1961, american engineers celebrated "50 years of flotation" and enshrined james hyde and his butte & superior mill. in 1977, german engineers celebrated the "hundredth anniversary of flotation" based on the brothers bessel patent of 1877. the historic glasdir copper mine site advertises its tours in wales as site of the "discovery of flotation" based upon the elmore brothers work. recent writers, because of the interest in celebrating women in science, champion carrie everson of denver as mother of the process based on her 1885 patent. omitted from this list are the engineers, metallurgists and chemists of minerals separation, ltd., which, at least in the american and australian courts, won control of froth flotation patents as well as right of claimant as discoverers of froth flotation. but, as historian martin lynch writes, "mineral separation would eventually prevail after taking the case to the us supreme court [and the house of lords], and in so doing earned for itself the cordial detestation of many in the mining world."