The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 121
h is on the sameprinciple as that of Fig. 86, the soft-, iron armature being pivoted on an: axis parallel to the cores, and at-tracted to the sides of the ends ofthe core, as shown in Fig. 90. A very neat form of ringer is shown in Fig. 91, as made by the Stromberg-Carlson Co. of Chicago. By… … Fig. 90.—Scale $ SUB-STATION APPARATUS 99 A good generator should give a steady ring on a 1000-ohmringer when joined through a resistance of 30,000 ohms con-nected in series or when the ringer isshunted with a 50-ohm shunt. Automatic Switch.—There are a numberof different patterns of these…
Telephone
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