. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. d are of extraordinary section,capable of withstanding muchmore strain than can ever comeupon them in the operation ofthe machine. They are turnedand finished all over, threaded onone end and provided with largeclamp nuts, by means of whichtension of the springs is regulatedto suit the work being are finished the full lengthto fit the sliding and fixed pedestals, both of which are bored true,making them guides as well as tension bars. The machine is provided with a sp
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. d are of extraordinary section,capable of withstanding muchmore strain than can ever comeupon them in the operation ofthe machine. They are turnedand finished all over, threaded onone end and provided with largeclamp nuts, by means of whichtension of the springs is regulatedto suit the work being are finished the full lengthto fit the sliding and fixed pedestals, both of which are bored true,making them guides as well as tension bars. The machine is provided with a special automatic feeder, as upon theregular feed and the even distribution of the ore across the face of therolls so much of the efficiency of the machines depends. In fig. 163will be seen one of these roller crushers being dismantled for the purposeof changing the shells. This company also makes a lower priced but very reliable set of rollscalled the New Economic. In this roll the sliding bearings for themovable roll are done away with and an arrangement of rocking arms,journaled on to the frame, is Fig. 162.—The Gates Roller Shell or Tyre. Speed and Capacity of Rolls.—In an excellent paper read beforethe Institution of Mining and Metallurgy, London, in February, 1902, myfriend Mr. Philip Argall, of Denver, Colorado, goes most fully and scientifi-cally into the construction and working of high-class rolls for dry crushing;for which purpose he, after a very long experience, considers them moreefficient than any other machine. The same general rules apply to wetcrushing, except that the crushing capacity is slightly greater. I amindebted to that paper for the subjoined particulars as to speed and capacityof rolls, and have the permission of the Council of the Institution to repro-duce the three diagrams here given (figs. 163, 165, 166), illustrating thepaper as published in the Transactions, [PLATE V.
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