. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. defect is that they are not continuous in theiraction, and do not deliver the products as they are separated, but, 3o MACHINERY FOR METALLIFEROUS MINES. owing to their construction, must of necessity allow them to accumulateon the surface of the table until the latter V^ecomes as full as it will holdwhen the machine must be stopped in order to be unloaded of itsconcentrates. Tlie inventive power of the American machinist overcamethis difficulty by removing the board at the top
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. defect is that they are not continuous in theiraction, and do not deliver the products as they are separated, but, 3o MACHINERY FOR METALLIFEROUS MINES. owing to their construction, must of necessity allow them to accumulateon the surface of the table until the latter V^ecomes as full as it will holdwhen the machine must be stopped in order to be unloaded of itsconcentrates. Tlie inventive power of the American machinist overcamethis difficulty by removing the board at the top end of the table, andallowing the concentrates to fall over the edge into a collecting case necessitated some structural alterations in the machine, which wmUbe seen in fig. 215. The tables are made of cast iron with a shallowborder, and curve up slightly towards the upper end in addition to theusual inclination allowed; and then the plate turns downwards on asharp curve, over which the concentrates (which, by the action of therepeated blows, have travelled upwards) fall into suitable receiving Fig. 216.—Hendvs Concentrator. The steriles are washed to the lower end, and are carried away by thestream of water to the outside of the mill. This machine, which I have seen and examined at work in Colorado,is well adapted for treating auriferous pyrites, or any ore containing onlyone mineral and the: gangue, because, owing to its construction, it willonly separate into two classes—rich and sterile. In this respect it isinferior to the old form, Avhich will separate two minerals from thegangue, as, for instance, galena and blende from quartz. Hendys Concentrator.—A concentrator which has met with somefavour as an enricher of the pulp from a stamp battery in a gold millis that known as Hendys. The pulp, after having passed over theamalgamated copper plates, and been deprived of whatever free gold itcontains, is sent on direct without classification to a Hendy, w
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