Bulletin . S/ee/p/ar/e. COOLEY TYPE OF HARZ JIG. ORE-DRESSrNG PRACTICE. 63 tailing end of the cleaner jig, and other jigs if used, also passes tothe settling tanks for subsequent treatment. The rougher jigs usually have 5 or 6 cells with a screening orgrate area ranging from 30 by 42 inches to 36 by 48 inches. Thespeed of the shaft connecting the plungers and the eccentrics variesfrom 90 to 120 revolutions per minute; the length of stroke of theplungers ranges from f inch to 1| inches. The cleaner jigs eachhave 6 or 7 cells with a grate area somewhat smaller than that ofthe rougher jigs. The s
Bulletin . S/ee/p/ar/e. COOLEY TYPE OF HARZ JIG. ORE-DRESSrNG PRACTICE. 63 tailing end of the cleaner jig, and other jigs if used, also passes tothe settling tanks for subsequent treatment. The rougher jigs usually have 5 or 6 cells with a screening orgrate area ranging from 30 by 42 inches to 36 by 48 inches. Thespeed of the shaft connecting the plungers and the eccentrics variesfrom 90 to 120 revolutions per minute; the length of stroke of theplungers ranges from f inch to 1| inches. The cleaner jigs eachhave 6 or 7 cells with a grate area somewhat smaller than that ofthe rougher jigs. The speed of the shaft connectmg the plungersand the eccentrics of cleaner jigs is 160 to 200 revolutions per minute;the length of stroke ranges from f to f inch. The chat or sand jigs,which are not commonly used, are smaller in size and usually have4 or 5 cells each, and are operated at a higher speed and shorterstroke. The material fed to the first cell of the rougher jig is, as a rule, notgraded or classified. A bed 5 to
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
