Annual report of the State Mineralogist for the year ending ... . ments as the occasion may require. The screen is constructed of finely perforated sheet copper, and a bedof clean ore is spread on it, the height and grain of which is regulated tosuit the size of the particles to be treated on the several compartmentsof the sieve. To these correspond similar ones in the lower part of the box or ves-sel, which terminate like funnels in points and collect the concentratedore, which is discharged through pipes at the lowest point in form of aturbid stream. The mixture about to be treated is charge
Annual report of the State Mineralogist for the year ending ... . ments as the occasion may require. The screen is constructed of finely perforated sheet copper, and a bedof clean ore is spread on it, the height and grain of which is regulated tosuit the size of the particles to be treated on the several compartmentsof the sieve. To these correspond similar ones in the lower part of the box or ves-sel, which terminate like funnels in points and collect the concentratedore, which is discharged through pipes at the lowest point in form of aturbid stream. The mixture about to be treated is charged either at the periphery ofthe concentration apparatus or at the center. In the latter case a circulardistributing disk z is provided. The concentrated matter is retained by the bed of clean ore, while thewaste is discharged through a vertical pipe in the center of the apparatus,in which is suspended a lead weight serving as a counter weight to thesieve and charge placed on it. The advantage of this apparatus over 816 REPORT OF THE STATE MINERALOGIST. Fig. the otherwise similarly constructed piston stream jig consists chiefly inthe fact that the different grades of classified material may be concen-trated at the same time on the same apparatus, and with the samelength of stroke for all. In this apparatus, as in the one describedbefore, the edge of the screen is tightly closed against the sides of thebox by means of a leather ring. The box is always kept full of water, the unavoidable loss during theoperation being constantly replaced through the feeding pipe at o. The machine makes two hundred to two hundred and twenty revolu-tions per minute, the stroke having a length of from five to six milli-meters. No intermediate products whatever are produced by this single product is the classified turbid stream, which passes the orebed, collects in the lower compartment of the box, and is discharged ina constant stream onto buddies placed below—one for every compa
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Keywords: ., bookcentury1800, booksubjectgeology, booksubjectminesandmineralr
