Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 473
instead of two and a polarized responsive deviceinstead of the usual non-polarized electro magnet. The circuitsof Mr. Deans system are shown in Fig. 331. The cord circuit shown in this figure is a simplified WesternElectric circuit, having four ringing keys, which are adapted toconnect the… … 451 452 AMERICAN TELEPHONE PRACTICE. scribers station, besides the usual talking apparatus, the bell mag-net, with its tuned reed and bell tapper, is bridged across the linein series with a condenser, C. Currents of= 2000, 4000, 6000 and8000 alternations per minute are used, these currents being…
Telephone
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