. Mining and Scientific Press . ratory has numerousadherents; it has been installed in two of the eight plants MINING AND SCIENTIFIC PRESS D& ember 3. L921 listed in the table. It is clear thai a machine of the jawneed not be nearly so heavy as one of the gyratorytype to break efficiently from coarse run-of-mine to 6 inThe determining factor may be whether the ca-pacity of the planl is sufficient to warranl the installagyratory breaker. Crushers. Rolls, disc-crushers, rod-mills, and ball-mills are used in reducing material of from 1 to one or more stages to J or J-in. mesh. Perhapsinte
. Mining and Scientific Press . ratory has numerousadherents; it has been installed in two of the eight plants MINING AND SCIENTIFIC PRESS D& ember 3. L921 listed in the table. It is clear thai a machine of the jawneed not be nearly so heavy as one of the gyratorytype to break efficiently from coarse run-of-mine to 6 inThe determining factor may be whether the ca-pacity of the planl is sufficient to warranl the installagyratory breaker. Crushers. Rolls, disc-crushers, rod-mills, and ball-mills are used in reducing material of from 1 to one or more stages to J or J-in. mesh. Perhapsintermediate crushing would be a more comprehensibleterm, but if breaking, crushing, and grinding areused to designate the successive stages of reduction,ing is the logical name for this stage. The seems to be preferable to roller-mill; it isboth descriptive and distinctive; the rod-mill is a millpartly filled with rods. The one-easy-stage idea is im-practicable except in small plants; indeed the number Concentrate. Oliver Filter • I 3OL10ATED COPPER CO. tages in which diminution from mine-ore to a flota-tion-pulp is accomplished, varies, roughly, in proportionto the capacity of the plant. The disc-crusher and thenewer machines; the fundamental ideaound principle - and each lias donework in actual operation. The rod-mill, in theins to have demonstrated its su-the ball-mill, both with reaped to the ca-pacity of a mill having tl dimensions and to the• • - ton of ore crushed, althoughson ?<•- the latter conclusion. It worksbest when the ratio of diminution is small, and when it is necessary to reduee the ore to finer than L20mesh. Il would be suitable for tin California win- h the grinding needs t. be carrii 1 only to GO or80 in I ventui the opinion thai tin desire to be in style liashelped to swing the pendulum toward the use of ball-mills rod-mills for crushing (I again distinguishthis from breaking and grinding), and that there wil
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