. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ch) of copper matte had been treated, on which duplicate samples were made byhand. The average assay contents cf these 54 lots were : TS.:* oz. gold, 1G871 oz. per cent, copper. The average differences between the two samples of each lot were0 43 oz. gold, 3*77 oz. silver, 071 per cent, copper. Since the introduction of the machine,2i lots of ore and 138 lots of matte have been run, the latter being of t
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ch) of copper matte had been treated, on which duplicate samples were made byhand. The average assay contents cf these 54 lots were : TS.:* oz. gold, 1G871 oz. per cent, copper. The average differences between the two samples of each lot were0 43 oz. gold, 3*77 oz. silver, 071 per cent, copper. Since the introduction of the machine,2i lots of ore and 138 lots of matte have been run, the latter being of the same general char-acter as the hand-sampled matte, except that it did not. as a rule, carry so much metal-lies. By reason of these inetallics. much of this matte was very ditficult to sample accu-rately, as will be easily understood. The weights of these 160 iots varied from 65 U)s. to42,000lbs., averaging not less than 30,000 lbs. Their average assay contents were 071 oz. gold,11204 oz. silver, 51 75 per cent, copper. The average differences between the two samplesof each lot were 002 oz. gold, 1*19 oz. silver, 02o per cent, copper. Reduced to percent- OEE SAMPLING. 603. Fig. C—Bridgemanssampler. a^es for the sake of comparison, the average differences were as follows : 54 hand samples—gold, 546 ; silver, 2-24 ; copper, 1-29. IGO machine samples—gold, 283 ; silver, 1 06;coppei-, 0*4o. Bridgemans Small Ore-sampling Machine (Fig. 6) is a modification of the large ma-chine. Its particular field of usefulness is the quicic and certaincutting down of the miscellaneous small samples (from 5 lbs. to50 t lbs. in weight) that are constantly being received by assayoffices. It will handle anything from the iinest nssay pulp tocrushed material of 4 in. or more in size. In operation, the ma-terial is fed either by hand or (with large lots) from a suitablysupported bucket into the funnel, F, the divider, I), being first setin rotation by hand, clockwork, or any convenient power. Th
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
