A Text book of General Physics for the Use of Colleges And Scientific Schools
The book A Text book of General Physics for the Use of Colleges And Scientific Schools was written by author Charles Sheldon Hastings Here you can read free online of A Text book of General Physics for the Use of Colleges And Scientific Schools book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of General Physics for the Use of Colleges And Scientific Schools a good or bad book?
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448. Transmitter. In the service of public telephone exchanges, the magneto - electric instru- Plo 320 ment of Fig. 319 is used solely as a receiver in connection with a transmitter operat- ing on the principle of the microphone. FIG. 321. In a very successful transmitter, known as the Running's type, the fluctuations of the battery current are produced by 494 TELEGRAPH AND TELEPHONE. passing the current from a diaphragm which is set vibrating by the voice, through a layer of hard carbon granul...es loosely arranged. Fig. 321 illustrates the form of this instrument used by the Bell Company in their long-distance telephones. D is the vibrating diaphragm held in place by the springs /, /', and isolated from external jars by the rubber packing ring e. B is a fixed carbon disc backed with metal, and connected to one terminal of a battery. E is a similar disc connected to the other terminal, and attached to the dia- phragm D at p f . The space between the discs is filled with granules of hard carbon, whose intimacy of contact varies with the vibrations of Z>, and produces a corresponding fluc- tuation in the strength of the battery current.
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