. American telephone practice . ed into the center of the yoke piece and passim freely through a hole n the MAGNETO CALLING APPARATUS. 125 armature, its head engaging the under surface of the permanentmagnet. Upon turning this screw in a left-handed direction withthe head bearing against the under side of the permanent magnet,the center portion of the yoke is forced downward against itsnatural tendency, thus allowing the ends of the armature to ap-proach more nearly the pole-pieces. Turning the screw in theother direction allows the spring of the yoke to force the armaturefurther from the pole
. American telephone practice . ed into the center of the yoke piece and passim freely through a hole n the MAGNETO CALLING APPARATUS. 125 armature, its head engaging the under surface of the permanentmagnet. Upon turning this screw in a left-handed direction withthe head bearing against the under side of the permanent magnet,the center portion of the yoke is forced downward against itsnatural tendency, thus allowing the ends of the armature to ap-proach more nearly the pole-pieces. Turning the screw in theother direction allows the spring of the yoke to force the armaturefurther from the pole-pieces, thus securing a coarser adjustment. Fig. 99 shows two views of the working parts of the Stromberg-Carlson ringer. This is similar to that of the Holtzer-CabotCompany, save for the method of adjustment. In this, the adjust-ment screw, B, projects entirely through the turns freely in the endof the magnet, A. The armature, C, is carried by the spring yoke,D, which fits over the pole-pieces, E E, which are held together by.
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
