. American telephone practice . FIG. OF BIASED BELL. been put into practice, probably the best form being that whereina linen or silk thread tied to the free end of the spring is woundaround a screw in a similar manner to the method used in adjusting. FIG. BIASED BELL. Morse relays. Such an adjustment as applied to a modern ringeris shown in Fig. 105. A ringer equipped for this purpose is usually termed a biasedbell or biased ringer. It is evident that when the current im-pulses are in such direction as to attract that end of the armature9 130 AMERICAN TELEPHONE PRACTI
. American telephone practice . FIG. OF BIASED BELL. been put into practice, probably the best form being that whereina linen or silk thread tied to the free end of the spring is woundaround a screw in a similar manner to the method used in adjusting. FIG. BIASED BELL. Morse relays. Such an adjustment as applied to a modern ringeris shown in Fig. 105. A ringer equipped for this purpose is usually termed a biasedbell or biased ringer. It is evident that when the current im-pulses are in such direction as to attract that end of the armature9 130 AMERICAN TELEPHONE PRACTICE. which is already held near its pole-piece by the spring, no furthereffect will take place. If, however, the current is in opposite direc-tion, it will cause the opposite end of the armature to be attractedto its pole-piece against the tension of the spring, thus causing thebells to ring. Biased bells require very careful adjustment and arenot altogether satisfactory, yet, as will be described later, they arewidely used in certain classes of work. CHAPTER IX. LOCAL BATTERY SUB-STATION EQUIPMENTS. So far talking apparatus and calling apparatus have been consid-ered separately. When both talking and calling apparatus areproperly combined for meeting the r
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