. Transactions. offer the onlyaccurate method. Curves plottedin the area below 200 mesh seemto follow no definite law, as thatof a hyperbola. Many operatorsmay feel but little interest in whathappens after a certain fineness(say 48 mesh) is reached, butthis does not alter the necessityof measuring the total work doneon the whole of the ore. As a method of measuring thework done in the region below 200mesh, I offer the following sug-gestion, not asserting that it isaccurate as to absolute results, but only that it yields additional evidenceas to the relative grinding resistances of ores. Produc
. Transactions. offer the onlyaccurate method. Curves plottedin the area below 200 mesh seemto follow no definite law, as thatof a hyperbola. Many operatorsmay feel but little interest in whathappens after a certain fineness(say 48 mesh) is reached, butthis does not alter the necessityof measuring the total work doneon the whole of the ore. As a method of measuring thework done in the region below 200mesh, I offer the following sug-gestion, not asserting that it isaccurate as to absolute results, but only that it yields additional evidenceas to the relative grinding resistances of ores. Product work (Rittingers law) = H + P + G + al + a2 + H™ +P oo - (H + ax + Ho.) = P + G-\-a2 + P™. (See diagram, p. 237.)For a given ore, assume that the material in the feed (say 20 per cent.)below 200 mesh has the same value in mesh-tons as the finest 20 per cent,in the product, that is, ai + H<b = Poo -f-#oo; or ai — P°°Substituting this value for Poo, and calling («i + a2) = A,Product work = P + G + A. Mesh- Kaciprocal Diam. Fig. 5. LUTHER W. LENNOX6 100 241
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
