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Jackson's Ceramic Calculations). The calculation depends on the fact that the more finely divided a material, the CERAMIC CHEMISTRY. greater is the total surface of its particles per unit mass. The average diameter of the four fractions usually obtained by elutriation are 0.005, 0.0175, 0.0325, 0.185mms. respectively, and the surfaces of equal masses of each fraction will be in the proportion 1111 325 1850 50 : 175 or 3367 : 962 : 518 : 91. To get the surface factor the percentage of each fraction is multiplied by its respective number i.e., the clay by 3,367, the rock dust by 962, the silt by 518, and the sand by 91. These products are added together, and the last two figures omitted. The number obtained is the surface factor, and the greater this number the finer the material. Thus, in A and B above, we have : A. B. 33 V 3367 111111 37 8