. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. t is subject to but little wear and tear. The cost of construction andmaintenance is thus reduced to a minimum. ;58 MACHINERY FOR METALLIFEROUS MINES. The principleas applied to oreconcentration i sentirely new, andcombines aregular forwardmovement ofthe mineral witha slight upwardthrow, similar tothat of the well-known hand van-ning shovels, aswill be seen from^ the In the older z beltless machines,z the movement is ^ obtained by meansu . 2 of toggles, givmg 2
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. t is subject to but little wear and tear. The cost of construction andmaintenance is thus reduced to a minimum. ;58 MACHINERY FOR METALLIFEROUS MINES. The principleas applied to oreconcentration i sentirely new, andcombines aregular forwardmovement ofthe mineral witha slight upwardthrow, similar tothat of the well-known hand van-ning shovels, aswill be seen from^ the In the older z beltless machines,z the movement is ^ obtained by meansu . 2 of toggles, givmg 2 a quick forwardg stroke, rapidly^ checked, but al-^ ways in a hori-m zontal line. Inf^ this new vanningi table, the recipro-o eating movement■^ is even in bothdirections, beingobtained from asimple eccentric,but owing to themanner in whichthe table is sup-ported on inclinedsprings, as seenin the diagrams,fig. 241, the sur-face receives aslight upward aswell as a forivardmovement at each stroke. The mineral particles are therefore rapidlyseparated into layers according to their specific gravities, the lighter. THE BUSS TABLE. 359 sands being on the top while the heaviest mineral remains next to thesurface of the table. The surface of the table is inclined and can be used either withor without riffles, and a constant stream of water flows across water washes off the barren upper layer into the tailings launder,while the heavier middlings being carried further along the table,follow next into another division of the launder, and are returnedautomatically by means of an elevator, shown in fig. 242, for retreatment. The heavier ores having a higher momentum than the lighterparticles, travel faster than the latter, and are carried still furtheralong the table, being washed off at the end of the table into separatelaunders which take them to suitable settling tanks. It is evidentthat the large surface of the table admits of the perfect separationof two or more different mine
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