Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 477
ed the device so thatthe proper rate was secured when the bell or gong was in place,rather than tuning with respect to the vibration of the reed alone,as had been the case in most former efforts in this direction. He also found that a polarized device was absolutely necessaryin order to secure the… … 456 AMERICAN TELEPHONE PRACTICE. en and destroy the vibration of the armature. He used one gonginstead of two because he found it impossible, when using twogongs, to make the ball strike more than one of them with anydegree of certainty. The machine for supplying the currents of the various…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-68-25.webp)
