Engineering & Mining Journal

APR 2016

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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E&MJ; 150 YEARS APRIL 2016 • E&MJ; 73 www.e-mj.com mclanahan.com for transmission around the mountain to the Ontario and Daly mines, f ve and a half miles distant, where it drives the mills and lights the surrounding build- ings. Current from these machines is also taken to light the neighboring town of Park City. "The San Miguel Gold Mining Co. are so well satisf ed with the result of operat- ing in Southeast Colorado, near Telluride, by long distance transmission, that they decided to largely increase their plant for themselves and neighbors, and the new plant is now being installed. This addition to the plant is supplied by the Westing- house Co. The Dodge Pulverizing Mill "This mill, for pulverizing ore either for amalgamation or concentration, has now gone through suff cient test during the past four years in California, Arizona and elsewhere..." The Dodge pulverizing mill consists of a hexagon drum or bar- rel, as shown, into which the ore, after passing through the rock breaker, is fed through a hopper. The barrel is lined with forged steel bars (each of the bars seen to the left of the side view form one side of the hexagon), which are held in place by wedges, secured by bolts and steel springs. These bars are spaced at ½-inch and from a grating through which the ore passes to the screens, which are on each side of the hexagon and afford a ready means of discharge for any ore that is crushed f ne enough to pass. With the mill being hexagonal in shape, the ore does not slide in mass, as is the case in cylindrical mills. The Cyclotomic Transit The novelty of this new transit lies in a f oating exterior ring placed around the periphery of the lower plate, upon which the f gures from 0 to 360 are engraved. These f gures are then no longer a f xed part of the circle, but possess that in- dependent rotation. Instead of turning the whole plate around its vertical axis, we turn a narrow metal band around the stationary plate, which is the same thing. As this band appears to be sliced from the plate, the name Cyclotome has been applied to it, from the Greek words for "ring" and to "to cut," that is a ring cut or severed from a disk. The Cyclotomic Transit.

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