Show THE CO concentrator the alsol is a new type of dry concentrator of high capacity built on scientific principles for saving of values and saving them at a minimum cost of power and upkeep the appearance of the alsol marks a new epoch in dry concentration since it combines the successful results of years of experience giving a machine having positive working qualities and saving values with the highest efficiency and utmost simplicity city the large percentage of fine values usually lost are saved by this system the methods employed for this saving are the use of a peculiarly shaped riffle board and a specially arranged air system the riffles fiffles are of an obtuse angled V shaped with one side the front or bottom side being longer than the other when in its working position a cross section presents an appearance similar to that of the lip of an ordinary gold pan when used by an expert at the upper or feed end of the table these riffles fiffles are of a comparatively large cross section and gradually taper down to a small cross section at the concentrator discharge end the object being to give a greater longitudinal angle to the upper rif fles besides reducing the capacity of the riffles fiffles at the discharge end the greater longitudinal angle has the effect of holding the values securely once they are caught since the riffle cuts sharply across the line of travel of the table movement the reduction of cross section positively eliminates gangue matter riding on top of the values the bottom sides of all riffles fiffles are pierced with a nozzle like perforation placed at such an angle as not 0 only to give the lifting effect necessary to allow the separation of the values but also to aid in a more rapid advance of the material the capacities range from one to twelve tons per hour on coarse crushed quality ores and from two to forty tons per hour on ordinary gold placer the horsepower is very low ranging from less than one horsepower in the smallest size to three horsepower in the larger sizes recent tests have shown remarkable results giving concentrates varying in size from one half mesh to finer than mesh all in one operation era tion thus eliminating a series of tables or other processes usually required for this wide range 0 |