and engineering journal . o see that the pieces arenot 1<K) big. The consequence is that crushing subsequentto the primarx l)ieaking must be employed in the majorityof cases. As a fact, some uoiks do only give the a single breaking, hut the pieces of stone fed intothe gnnding machinery aie iaige, and must tend to wearthe latter out more quicklv than if secondary crushing hadbeen resorted to. Secondary crushers may be of severalshapes. They may, for example, be ordinary jaw crushersof the type shown in Fig. 1, but with jaws arranged to dealwith the pieces of material
and engineering journal . o see that the pieces arenot 1<K) big. The consequence is that crushing subsequentto the primarx l)ieaking must be employed in the majorityof cases. As a fact, some uoiks do only give the a single breaking, hut the pieces of stone fed intothe gnnding machinery aie iaige, and must tend to wearthe latter out more quicklv than if secondary crushing hadbeen resorted to. Secondary crushers may be of severalshapes. They may, for example, be ordinary jaw crushersof the type shown in Fig. 1, but with jaws arranged to dealwith the pieces of material discharged from the primarybreakers; but whilst the jaw ci-usher possesses certain dis-tinct advantages in the readiness with which it will take thelarger pieces of stone and reduce them to the size required,and the comparative ease with which the size of the fin-ished product can be adjusted, it is restricted in capacityfor finer crushing, as compared with high-speed rolls orwith disc crushers. Which of these two latter types-will. V, :, Fig 4.—HoRizoNT.\L Roll Crusher. be chosen will depend largely on circumstances and indivi-dual taste. The roll type will meet all ordinary require-ments. An example of it is shown in Fig. 4, which repre-sents one of two similar sets supphed by Messrs. Hadfieldsfor Canada. In this machine the rolls are 4ft. 6in. in dia-meter and wide. They are fitted witli renewable cor-rugated shells of Era manganese steel, and they are oper-ated at a speed of from 60 to 80 revolutions per minute. THE SOUTH AFKICAN MINING JOURNAL. Johannesburg, July 10, 1915. Paint Your Cyanide Tanks With RUSAC 99 ANTI-CORROSIVE VARNISH, A Unique Preparation for Protecting ExposedMetal Work of all kinds from Corrosion, etc. SOUTH AFRICAN GENERAL ELECTRIC CO., SOUTHERN LIFE BUILDINGS, B Box 1905. JOHANNESBURG. •Phonc 4321. NOURSE MINES, LIMITED. INVESTORS DIARY. (INXORPOBATED IN THE TRANSVAAL.) FORTHCOMING COMPANY MEETINGS. DECLARATION OF DIVIDEND No. 22. July 16.—
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
