Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 149
FIG. 101—PARTS OF KELLOGG RINGER. adjustment. A hexagonal nut is carried on each screw in order tolock the screw in any desired position. … FIG. 102.—KELLOGG RINGER ASSEMBLED. The ringer shown in Fig. 103 is unique and embodies several de-sirable features, although it has become obselete. The two ends of 128 AMERICAN TELEPHONE PRACTICE. the U-shaped permanent magnet are of the same polarity, itsmiddle being of the opposite polarity.…
Telephone
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