This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...mm. to 0, and dividing the sum of these diameters by two to get the average diameter. It is of course impossible at this point to obtain a value that is entirely satisfactory. All conclusions were based on gross power since the figures given in Table 177 for net power obtained by subtracting the power when running ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...mm. to 0, and dividing the sum of these diameters by two to get the average diameter. It is of course impossible at this point to obtain a value that is entirely satisfactory. All conclusions were based on gross power since the figures given in Table 177 for net power obtained by subtracting the power when running empty from the gross power, do not properly express the power applied to crushing. The conclusions arrived at were that the ratio of work done to increase of Burface is fairly constant with coarser sizes, but with finer sizes the increase of surface is much more rapid than the work required to produce it. For Przibram ore he advanced the conclusion that the increase of surface per horse power varies between 20 and 40 square meters and approaches an average of 25 square meters only under similar conditions of crushing when the quantities of feed are chosen to correspond, since the power used is dependent upon, but is not proportional o the amount of feed. Incidentally the work brought out the following additional facts. It should be borne in mind that in his tests the rolls were all doing free crushing. Slow running rolls produce more fines than fast running, the quantity of returns to be recrushed being the same and the capacity per horse power less with the slow rolls. With spaced rolls crushing moderately fine material the quantity of returns is considerably higher than with close rolls, the amount of fines being the same and the capacity per horse power higher in the former case. Spaced rolls are to be recommended for coarse crushing only. Spaced rolls counteract the tendency of slow running to produce fines. For economy rolls should be run as nearly to full capacity as possible since the capacity per gross horse power increases with the increa...
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