. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fi), and the ore is fed in from the hopper by means of a screwpropeller fixed on to the shaft. The mill will work either dry or wet, and the pulp falls into the hopper(e) which forms part of the exterior fixed casing of the mill. In dry crushing,if it is desired to remove the fine dust, the upper funnel {/c) is connected. Fig. 170.—Cross Section of the Gruson Ball Mill. with an exhaust fan which carries away the light impalpable powder to bedeposited on a dust chamber. All the
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fi), and the ore is fed in from the hopper by means of a screwpropeller fixed on to the shaft. The mill will work either dry or wet, and the pulp falls into the hopper(e) which forms part of the exterior fixed casing of the mill. In dry crushing,if it is desired to remove the fine dust, the upper funnel {/c) is connected. Fig. 170.—Cross Section of the Gruson Ball Mill. with an exhaust fan which carries away the light impalpable powder to bedeposited on a dust chamber. All the working parts are made of the best drilled iron and cast steel;and the makers claim that, owing to their long experience in steel makingfor armour plates and war material, they have succeeded in turning out ametal which will resist the wear and tear inseparable from a pulverisingmachine. I have no personal acquaintance with this machine, but Ihave heard good accounts of the work it has done in the dry and wetcrushing of gold ores. CHAPTER XII. COARSE CONCENTRATION MACHINERY ico7itt?tued). Stamps—Specification of lO-Stamp Battery—The Iron-framed Battery—Steam Stamps—The Tremain Steam Stamp—Imperfections of Stamp Batteries Stamps.—Machines for the purpose of pulverising ore by meansof stamps imitating the action of a spaUing hammer were in use somethree centuries ago in Cornwall, and, indeed, in some of the smallermin
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