Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 387
365 the apparatus save that actually concerned in ringing the called sub-scriber are omitted. In this the ringing key, K, is provided with a clutch magnet, m,which, when the key is depressed into its ringing position, after theplug has been inserted in a jack, holds the springs of the key in… … FIG. 28S.-WESTERN ELECTRIC AUTOMATIC RINGING CIRCUIT, subscribers station and back on the tip side of the line to thegrounded generator brush. The interrupter is constantly revolving.It is arranged so that the circuit of the generator will be closed tothe ringing key for one second out of every…
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