Pattinson
Pattinson : (1) A process for extracting silver from lead by selective crystallization. When molten lead is cooled, the first crystals of lead contain less silver than the residual melt. Repetition of this process a number of times yields a silver concentrate which is further purified by cupellation. (2) A process for making pure magnesium compounds from calcined dolomite, using the high solubility in water of magnesium hydrogen carbonate, Mg(HCO3)2