Transactions . ery is useless except for the purposes of lining. For at least afoot in, the possible fall of the pebbles is so slight as to be valuelessfor crushing. The result is, neglecting part of the apex of the conewhere the energy is too small to be effective, the Hardinge millresolves itself automatically into a short tube mill, the 8-ft. size pro-ducing about the same effect as a 5 by 5 or 6 by 6 ft. tube mill, as inFiff. 3. 1 Tram., xlv., 201 (1913). 62 HARDINGE MILLS VS. CHILEAN MILLS. Perhaps I am like the sailors mother who could credit his storyabout the mermaids, but refused to b
Transactions . ery is useless except for the purposes of lining. For at least afoot in, the possible fall of the pebbles is so slight as to be valuelessfor crushing. The result is, neglecting part of the apex of the conewhere the energy is too small to be effective, the Hardinge millresolves itself automatically into a short tube mill, the 8-ft. size pro-ducing about the same effect as a 5 by 5 or 6 by 6 ft. tube mill, as inFiff. 3. 1 Tram., xlv., 201 (1913). 62 HARDINGE MILLS VS. CHILEAN MILLS. Perhaps I am like the sailors mother who could credit his storyabout the mermaids, but refused to believe what he told her about theflying fish. The segregation of the pebbles is entirely reasonable, thesurvival of the most energetic, but how can the fines separate them-selves from the coarse in the turmoil taking place within the crushingzone ? The particle has got to go where it is knocked, the agitationis too great for it to follow any laws of classification, and it with the Outside 8 Hardinge 9 750 p. mr. Fig. 4.—Diagrammatic Representation of the Action in a Tube Mill. others passes through by displacement and chance, perhaps gettingthrough without being hit at all; or again, a single particle in the finalpulp may be the result of perhaps a hundred blows. In Figs. 4 and 5 are plotted some graphical results of calculation ofwhat goes on inside a tube mil], particularly of the Hardinge concentric circles in Fig. 4 represent planes through the velocity of each of these circles, based on rev. per minute. HARDINGE MILLS VS. CHILEAN MILLS. 63 is indicated in the lower right-hand quadrant. Applying the princi-ples of mechanics, it will be found that pebbles will become free tofall when reaching the half-circle drawn in the upper right-hand quad-rant, going up, and their paths from that time on will without inter-ference follow the paths P2, P5, Pg, etc. Centrifugal force is too greaton the outer ring of pebbles to let them move. Supposing pebbles tole
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
