Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 151
FIG. 104.—DIAGRAM 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. 105.—MODERN 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…
Telephone
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