A Text book of General Physics for the Use of Colleges And Scientific Schools
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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.
What to read after A Text book of General Physics for the Use of Colleges And Scientific Schools?
You can find similar books in the "Read Also" column, or choose other free books by Charles Sheldon Hastings to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after A Text book of General Physics for the Use of Colleges And Scientific Schools?
You can find similar books in the "Read Also" column, or choose other free books by Charles Sheldon Hastings to read onlineMoreLess
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