. Transactions. )« 14 1* 10 Diameter* Id Millimeter* ki>inaky Di&sct Plot of Sj/.inito indicate that if a 20-mm. screen had followed the it would have retained 37 per cent, of the ore; but that Fig. 36 34 33 30 16 14 13 10 Diameters in Millireters Cumulative Direct Plot of Sizing-Test-. ibsurd, for the 16-mm. screen retained only per cent.,and the 20-mm. screen would, of course, fail to retain certains that were caught bv the 16-mm. screen. Other forms ofplot show that a 20-mm. screen would have retained percent, of the ore, a fact which this curve affords no means of
. Transactions. )« 14 1* 10 Diameter* Id Millimeter* ki>inaky Di&sct Plot of Sj/.inito indicate that if a 20-mm. screen had followed the it would have retained 37 per cent, of the ore; but that Fig. 36 34 33 30 16 14 13 10 Diameters in Millireters Cumulative Direct Plot of Sizing-Test-. ibsurd, for the 16-mm. screen retained only per cent.,and the 20-mm. screen would, of course, fail to retain certains that were caught bv the 16-mm. screen. Other forms ofplot show that a 20-mm. screen would have retained percent, of the ore, a fact which this curve affords no means ofdetermination. 272 Tin: PLOTTING OP SIZING-TESTS. Luther Wagoner, in a paper, The Theory of Ore-Crush-ing, uses a method wherein the scale of sizes is laid off ona horizontal line just as in the first described method, but thequantities are represented by indicating cumulative percentages on the vertical seale. The curves in Fig. 2 are drawn by thismethod, and this form of plot may be called a cumulative directplot. Its use is illustrated by reference to curve No. 2, fromwhich may be read that 18 per cent, of the material under testis coarser than 16-mm., 50 per cent, coarser than 12-mm., and82 per cent, co
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