. Mining and Scientific Press . .. 454:> to 60 .... 1 45 to 60 60 to 80 50 to 65 80 to ino 2Mi - 100 to 120 Thi r is used almost entirely in the buc- ei ssive reduction of ore and rock to comparatively smalland usually takes the discharge of swing-jawcrushers or gyratories. In comparison with gyratorieafor Btage reduction, it takes less bead room; in addition,it is asserted, a greater tonnage of material can becrushed per unit oi power expended. This is due un-doubtedly the fad that the ore during crushing travelstoward an increasing discharge-area, and ool toward adecreasing one, as wi
. Mining and Scientific Press . .. 454:> to 60 .... 1 45 to 60 60 to 80 50 to 65 80 to ino 2Mi - 100 to 120 Thi r is used almost entirely in the buc- ei ssive reduction of ore and rock to comparatively smalland usually takes the discharge of swing-jawcrushers or gyratories. In comparison with gyratorieafor Btage reduction, it takes less bead room; in addition,it is asserted, a greater tonnage of material can becrushed per unit oi power expended. This is due un-doubtedly the fad that the ore during crushing travelstoward an increasing discharge-area, and ool toward adecreasing one, as with the gyratory. As compared withjaw-crushers, the disc machine is handicapped by thefacl thai the possible range of reduction is considerablylower, but this is more than offsel in mosl cases by thecharacter of the produd and the maintenance of a uni-formity in this reaped throughout the entire life of thewearing parts of the machine. The same favorable factor constitutes a point of superiority in the disc-crusher Ratchet Screw. Inner Disc-Fig. 3. method of seclhim i kt-uing-disc to inner shaft MINING AND SCIENTIFIC PRESS December 17. 1H21 rolls When using the latter the probli ms of corru-gation and groot insistent, and the > laracter ofthe product changes according to the condition of the shells. The principle on which the vertical disc-crusher op-erates is essentially the same as that of the horizontalmachine. It will lie seen by referring to the accompany-ing illustration ( Fig. 1 that the disc-shafts are principal difference between the horizontal and vert ical machines is thai the size of the product from the latteris controlled by the minimum discharge-opening be-tween the discs, whereas the product from the vertical-disc machine is gauged by the maximum opening be-tween the discs. In this respect maximum and mini-mum are terms referring to the variations in distance relatively fine grinding. For example, when crushing to} in. the minimum exit is fixed at
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