Abstract
I REGRET to have misunderstood Mr. Rosales, whose report is certainly entitled to most respectful and careful consideration. My mistake (a natural one, I think) arose from a statement made on p. 13 of the report. Here Mr. Rosales says, in speaking of the Johnson's Reef Gold Mines Company, Eaglehawk, that “the battery sand should previously be classified into different grades by ‘sizing’.…Such could be accomplished by delivering it into trommels fitted with screens of different meshes. The mantel of the first trommel might be a sieve of 40 to 50 holes to the lineal inch, and the second trommel might be covered with a screen of 64 holes to the lineal inch. … This system of sizing would certainly be applicable.” (Theitalics are my own.) On p. 50, where Mr. Rosales recurs to the subject of trommels, he does not mention any screen finer than 40-mesh, but, on the otherhand, does not state that this is the finest that should be used, and refers to it merely in the following words:—“Supposing it ‘i.e. the trommel] to be covered with 1/32 or 1/40 wire gauze.” Mr. Rosales' explanation will, I feel sure, be gladly received by others, besides myself, who have read his valuable report.
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ROSE, T. Classifying Crushed Ore by Trommels. Nature 53, 488 (1896). https://doi.org/10.1038/053488a0
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DOI: https://doi.org/10.1038/053488a0
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