. Transactions. .4 on mm. (a).. on 1 f on mm | 1 on mm 1l 0 025 on mm | \ on mm | 1 mm J I 99 0 Total ,, (a) Round-hole sieves were used down to and including mm.; then square holes downto and including mm. Below mm
. Transactions. .4 on mm. (a).. on 1 f on mm | 1 on mm 1l 0 025 on mm | \ on mm | 1 mm J I 99 0 Total ,, (a) Round-hole sieves were used down to and including mm.; then square holes downto and including mm. Below mm. settling in water was used, and the sizes givenare diameters of quartz which settled a depth of 90 mm. in 15, 30, 60, 120 and 300 seconds. Allof the settled products contained some grains of mineral heavier than quartz, and these grainswere smaller than the quartz-grains. (6) This was all foreign material, such as chips, etc. III! !M Tabli XI.—Sizing-1 \ <ng.). (a) Round-hole sieves were used down to and including mm.: then square holes down to and including069 mm. Below mm. settling in water was used, and the sizes given are diameters of quartz which?ttled a depth of 90 mm. in 15, 30, 60,120 and 300 seconds. All of the settled products contained some grainsf mineral heavier than quartz, and these grains were smaller than the quartz-grains. 270 THK PLOTTING OF BIZINO-TBSTS. Tabular and Graphic Representation of Siziny- Tests—In TablesIV. to XL two columns of figures are given for each Qumbers in the first column show the per cent, by weightof each size. The numbers in the second column, headed Cumulative per cent., show the total per cent, of the size andall coarser, and represent the percentage of the whole samplewhich would rest on the screen, were it used alone. The cumu-lative per cent, is particularly useful in the preparation ofsome of the graphic diagrams explained later. A graphic method of representing sizi
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
