. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 204.—Elliptic Gearing for Jiggers. SLIME JIGGERS. 299 is fitted with two discharge openings, one of which, if necessary,remains closed. The average stroke is about 5 mm., say i in., and the speed 220 strokesper minute. The clean water supply is delivered under the sieves andis controlled by a tap. These jiggers are designed to treat the mineral supplied by the firstcompartment of an hydraulic classifier or spitzlutten, the stuff from thesecond being sent to a circular perc
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 204.—Elliptic Gearing for Jiggers. SLIME JIGGERS. 299 is fitted with two discharge openings, one of which, if necessary,remains closed. The average stroke is about 5 mm., say i in., and the speed 220 strokesper minute. The clean water supply is delivered under the sieves andis controlled by a tap. These jiggers are designed to treat the mineral supplied by the firstcompartment of an hydraulic classifier or spitzlutten, the stuff from thesecond being sent to a circular percussion (fig. 205), and that of the thirdto the Liihrig Vanner, as described on page 346 and fig. 234. Bilharz Circular Fercussioti Jigger.—In the description of the leadconcentrating mill at the Neuhof mine in Silesia, given on page 446, it willbe noticed that the sands from the classifier (l), Plates XII. and XIII.,. Fig. 205.—Bilharz Slime Jiggers. are treated partly in fine slime, or Hartz jiggers (r, r, and r) and partlyin circular Bilharz jiggers (s, s). The following is a description of thesecircular jiggers : The machine (fig. 206) consists of a circular sieve, which is movedvertically by means of an eccentric at the rate of from 200 to 220 strokesper minute, the length of the stroke being from 5 to 6 mm., in a circularouter box, round at the top and cone-shaped below. The sieve is dividedinto a number of compartments, usually six, according to the requirements,and each compartment carries a bed the size and height of which areregulated according to the size of the material to be treated. The mineral is fed on to the machine radially ; the rich ore passesthrough the sieve as in ordinary jiggers, and is discharged through a pipe atthe bottom in a thick state of consistency, while the tailings pass away lOO MACHINERY FOR METALLIFEROUS MINES. through a pipe in the centre of the machine. The w
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