. Transactions. automatically by plot-ting the logarithms of the diameters on the horizontal line,and Fig. 3 represents this method applied to the same data 4 Transactions of the Technical Society of the Pacific Coast, , 1886, p. 45. I III PL01 I ING I SlZINd I already presented bv the other methods. Ii the logarithm! ofthe diameters are multiplied by the constant L, anmbeiconvenient for plotting are Beoured, because thev are wholeDumbers for the diameters r the Etittinger Bcale, and tiemultiples of the common Logarithms are given in Table I. forconvenience in plotting. The negativ
. Transactions. automatically by plot-ting the logarithms of the diameters on the horizontal line,and Fig. 3 represents this method applied to the same data 4 Transactions of the Technical Society of the Pacific Coast, , 1886, p. 45. I III PL01 I ING I SlZINd I already presented bv the other methods. Ii the logarithm! ofthe diameters are multiplied by the constant L, anmbeiconvenient for plotting are Beoured, because thev are wholeDumbers for the diameters r the Etittinger Bcale, and tiemultiples of the common Logarithms are given in Table I. forconvenience in plotting. The negative quality of the Loga-rithm of all numbers Less than unity musl be kepi in mind,and Bince the Logarithm t unity is zero, the original point forthe Bcale of Bizes will be at the unit diameter, and Bmaller Bizeswill be scaled to the right and larger Bizes to the lefl fromthai point. This form of plot may be called the cumulativeLogarithmic plot. It has been used by the Afassachusetts State Fig. ? 32 8 4 9 1 . Diameters in Millimeters (Logarithmic Scale ) Cumulative Logarithmic Plot of Sizing-Tests. * The scale has been so chosen that the logarithm of any diameter must bemultiplied by in order to get the number of spaces on the plot. Board of Health5 for plotting sizing-curves of filtering-mate-rials. The curves resulting from this method fulfill every require-ment for graphic representation. Its compliance with the first i requirements is easily shown by reference to curve Xo. 1 in Fig. 3. We read that 78 per cent, of the sample is coarser than a 20-mm. screen, and that per cent, is coarser than -mm. screen, therefore per cent, of the material will fall between these sizes. It is also evident that the ep portions of the curve show the range of predominantsizes. Referring again to curve No. 1, we see that 95 per cent,of the sample falls between 16 mm. and 40 mm., and by curve 5 Filtration of Sewage—Mechanical Co
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