. Transactions. MUV^wrf Fig. 1.—Flushing Culm into the Troughs which Feed the Conveyoes. 616 ANTH R ANTHRACITE-WASHERIES. 617 the revolving, circular screen has been almost entirely super-seded by those of the flat, shaking type, because the fine mesh

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries