A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . al position, and the orey matter is again admittedthrough H. One boy can manage twenty of these frames. When employed in cleaning tinstuff, the two cofers o and p are discharged into separate pits about 15 feet long, 6 feetwide, and 12 or 15 inches deep. The refuse from the end of the frames, iis well as the slimywater from the displacing box, is either thrown away or subjected to further treatment; thecover 0 is usually taken to the hand frames, after which it
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . al position, and the orey matter is again admittedthrough H. One boy can manage twenty of these frames. When employed in cleaning tinstuff, the two cofers o and p are discharged into separate pits about 15 feet long, 6 feetwide, and 12 or 15 inches deep. The refuse from the end of the frames, iis well as the slimywater from the displacing box, is either thrown away or subjected to further treatment; thecover 0 is usually taken to the hand frames, after which it is tossed and packed, whilst thestuff from cover p is again submitted to machine framing. Hancocks Slide Frame.—The ores and accompanying waste are brought into a state ofsuspension by water, and are then by adjustment made to pass over a slight fall, so as toproduce the greatest regularity in its flow over tables fixed upon a given incline, each tablehaving a sufficient drop from the table above. When the tallies are sufficiently charged,clean water is introduced to pass over the charged table. The surfaces of the tables are. 874 ORES, DRESSING OF. subject to the action of brushes or brooms during a part or the whole time of both opera-tions until the ores are sulficiently cleaned. In some cases the use of such brushes orbrooms is dispensed with. The ores (on the tables) thus cleaned are washed off into cis-terns by the action of water passing over the surfaces of the tables after they are raised tonearly perpendicular positions. Fig. 524 represents, 1, Iramework to carry the gear on each side of the machine; 2,the stretcher or pivot piece on which all the tables are resting; 3, centre bearings of thetables, to which is attached an adjusting screw for raising or falling them ; 4, a slide valve,which admits or shuts oft, as required, the ores, which are previously brought into a thinconsistency with water; 5, launder through which the ores pass to the heads, which aredivided
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
