. United States Court of Appeals For the Ninth Circuit. or os- cillatory movement in a horizontal plane,spiral riffles on the table expanding outward 25toward the periphery of the pan, and meansto impart an oscillatory movement to the Ean to cause the heavier particles on the ta-le to travel between the A concentrating pan or table having a 30concaved upper surface and mounted upon acentral support for oscillatory movement ina horizontal plane: said table being essen-tially evolute in outline, riffles on the tablehaving their outer ends relatively more re- 35mote from the center of
. United States Court of Appeals For the Ninth Circuit. or os- cillatory movement in a horizontal plane,spiral riffles on the table expanding outward 25toward the periphery of the pan, and meansto impart an oscillatory movement to the Ean to cause the heavier particles on the ta-le to travel between the A concentrating pan or table having a 30concaved upper surface and mounted upon acentral support for oscillatory movement ina horizontal plane: said table being essen-tially evolute in outline, riffles on the tablehaving their outer ends relatively more re- 35mote from the center of the table than theirinner ends are, means for dehvering materialand water upon the table, and means for giv-ing the table an oscillatory movement. In witness whereof I have hereunto set my 40hand. JOSEPH W. FINDER. Witnesses; Henkt p. Teicou, S. H. NOURSE. No. 830,425. :OMPLAINANTS EXHIBIT No. 54 Ford Patent No. 830,425 4LMON E. HART, Special Examiner PATENTED SEPT. 4, E. CONCENTRATOR. APPLICATION FILED MAT 10, 1905. 4 SHEETS-SHEET r. Ho. 830,425. PATENTED SEPT. 4, 1906. W. E, FORD,ORE CONCENTRATOR, APPLICATION PILED MAYIO, 1905. 4 SHEETS-SHEET 2
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