A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . and that which is to be dis-charged at J J into the shoot k. At L the larger and denser portion of the mineral which has fallen through the ascend-ing current of water, is conveyed either to a jigging machine or some other enriching appa-ratus. Mr. Borlase first erected this apparatus in the United States of America, where itwas found to answer remarkably well, and he was induced by this success to attempt its gen-eral introduction in this country. In this endea
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . and that which is to be dis-charged at J J into the shoot k. At L the larger and denser portion of the mineral which has fallen through the ascend-ing current of water, is conveyed either to a jigging machine or some other enriching appa-ratus. Mr. Borlase first erected this apparatus in the United States of America, where itwas found to answer remarkably well, and he was induced by this success to attempt its gen-eral introduction in this country. In this endeavor he has not, however, been as yet soentirely successful as could be wished, as the English mines, and particularly those of Corn-wall, are for the most part managed by individuals who require to be fully convinced of theutility of any new invention before giving it a trial. This machine has been employed withgreat success at the mines of Allenheads. The comparative results afforded by BorlascsTrunking Machine and the common Nicking Trunks may be seen from the following statis-tical statement. ORES, DRESSING OF. A ../ 496 857. Lead Mines, of trials with Borlases 4^ feet Circular Lead Ore, Sludge, and Slime DressingMachine, and the common Nicking Trunks, March, 1859. Fortj-four wheelbarrows full ofexactly the same description of slimes were put through each of the respective processes. Machine in operation -Occupied in oiling machineryDitto emptying ...Stirring, nicking, and empty-ing trunks - - . .Occupied dollying the work - Labor of men and boys em-ployed .... TIME. Borlase s Machine. Trunlis. Difference. ! Hours. 15 0 2 01 019 Hours. 00 00 0 14 32 0 0 0 Min. !0 i 0 j 00, 19 52 16 3 3 49 COST. £0 s. 3* £ s. d. 0 8 8 £0 8. 5 PROnUCE. Ore. Lead. Ore. Lead. Ore. Lead. St. lbs. Ass-iy. lbs. St. lbs. lbs. St. lbs. St. Best work - . • -Seconds .... Thirds Fourths .... 54 in§ 10 3i 21 9^ 22 9 p. cent
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
