Bulletin . arallelwith and equidistant fromthe sloping sides of theclassifier. The pulp, as itdrops down through thenarrow passage thus form-ed, meets the rising currentof water from the pipe e;hence all the particles dis-charged through d mustpass through this upwardflow. The block c is fas-tened to a vertical shaftthat can be raised or low-ered, thus varying thewidth of the aperture. Theaperture, measured at rightangles to the sides, is usu-ally \ inch to f inch wide,depending on the size of thematerial passing into theclassifier. In C, figure 12, the wateris forced in through a ver-tical pi
Bulletin . arallelwith and equidistant fromthe sloping sides of theclassifier. The pulp, as itdrops down through thenarrow passage thus form-ed, meets the rising currentof water from the pipe e;hence all the particles dis-charged through d mustpass through this upwardflow. The block c is fas-tened to a vertical shaftthat can be raised or low-ered, thus varying thewidth of the aperture. Theaperture, measured at rightangles to the sides, is usu-ally \ inch to f inch wide,depending on the size of thematerial passing into theclassifier. In C, figure 12, the wateris forced in through a ver-tical pipe e from the top,and not through a horizon-tal pipe from the side, as inthe first two classifiers de-scribed. As the water dis-charges imder pressure atthe lower end of the verti-cal pipe e it strikes againsta horizontal disk or plate c of the same shape as the cross section ofthe sorting column, and consequently tends to rebound up throughthe sorting column against the downward flow of the pulp. This disk. FiGUEE 13.—Bird classifier. ORE-DRESSING PRACTICE. 81 or plate is so placed that its edges are equidistant from the sides ofthe sorting column, forming an opening ^ to | inch wide. Theparticles pass thi-ough this aperture and discharge at d. The classifier represented in D, figure 12, is found in only a few ofthe mills. The vertical pipe e terminates in a bell that is closed atthe end and has around the sides small circular openings, aboutone-fourth inch in diameter, through which the water passes. Theaction of the water is about the same as in classifier C, except thatthe flow is divided by the circular openings into small streams. Thistype of classifier is said to give good results. Classifiers of the Richards-Janney type are found in a few mills;also, a local machine known as the Bird classifier. A self-explanatorysketch of this classifier is given in figure 13. The vertical J-inch airpipes, 1, 2, 3, and 4, extend into the different parts of the classifier toprevent an
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