escape through the opening, «. The ings and valuable mineral will be graded into different C. Voss, of El Paso, Texas. movements are reversed when steam enters the other sizes in their respective boxes, and the larger particles end ot the cylinder. If necessary, the engineer can of the former may… … apparently carefully prepared paper on this subject (Bulletin Buffalo Society Natural Sciences, v., pp. 49-71, This invention has been patented by Mr. William 1886) details many experiments which he has . tried, and several of them point very strongly to the con- Stoffel, of McHenry, Illinois.…
