E/MJ : engineering and mining journal . the air gap affects the other gaps equally; therefore arelative variation in the length of the air gap is QoiBought. Under all conditions the separating fields of thethree zones have the same shape, and the mosl favorableform for the one zone is secured at the same time for theothers. The length of the polepieces for the different zones isvaried to produce a certain ratio id strength, which inthis ease was determined as 1:5:10. A ratio as largeas this one is unattainable in the arrangemenl id Fig. this ratio of field strength is determined by the
E/MJ : engineering and mining journal . the air gap affects the other gaps equally; therefore arelative variation in the length of the air gap is QoiBought. Under all conditions the separating fields of thethree zones have the same shape, and the mosl favorableform for the one zone is secured at the same time for theothers. The length of the polepieces for the different zones isvaried to produce a certain ratio id strength, which inthis ease was determined as 1:5:10. A ratio as largeas this one is unattainable in the arrangemenl id Fig. this ratio of field strength is determined by thelengths of air spaces between successive poles and theirvertical dimensions, which need not lie changed it themaximum possible is provided for, a reduction can hemade by reducing the reluctances in the different hori-zontal air gaps. This can be accomplished in the sim-plest manner by placing iron-bridging pieces, l> in Fig. 5,across two or all zones, their section and permeabilitydetermining the reduction in reluctance. This method. FIG. 6. LINES op FLUX IN JOBKB MACHINE FIELDSHOWN BY IRON FILINGS permits a regulation over the widesl range, a- either the thinnest sheet and wire or solid bar-, filling the total airgap. can be employed. In this manner a wide ranusefulness is secured since the machine may be employeda- a multizonal high-intensity separator, with extremedifferences of strength, or a- a concentrator of laipacity tor -tron- and me lium magnetic on-, since therecaii be several edges employed of slighth differenl -nto take oil concentrates, or dThe number of zones i- not limited, provided the elec- tromagnei is able to delivet the issary flux. Fig. fl shows the lines of iron filings made by the ma-chine of Pig. 5, which demonstrates thai with an apparent irregular sha] £ pole-, the flux regularly and that the space betwi filled with lines of force of low density. The separator providedwith this Held has a single system of i high intensity and a continued width of
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
