. Electrical world. ditions specifically indicate its advantages. He advocated an arrange-ment which is essentially a single main bus-bar and a series of groupbuses, which may be interconnected to form a reserve main bus incase of trouble or to facilitate work upon the main bus. April 2, 1904. ELECTRICAL WORLD and ENGINEER. 635 Simultaneous Telephone and Telegraph Equipment. By Le Roy VV. Stanton. THE apparatus entering into tlie equipment of a modern long-distance telepKone line includes not only special telephoneapparatus, but also apparatus for making practical the use ofthe telegraph in co
. Electrical world. ditions specifically indicate its advantages. He advocated an arrange-ment which is essentially a single main bus-bar and a series of groupbuses, which may be interconnected to form a reserve main bus incase of trouble or to facilitate work upon the main bus. April 2, 1904. ELECTRICAL WORLD and ENGINEER. 635 Simultaneous Telephone and Telegraph Equipment. By Le Roy VV. Stanton. THE apparatus entering into tlie equipment of a modern long-distance telepKone line includes not only special telephoneapparatus, but also apparatus for making practical the use ofthe telegraph in connection with the telephone, so that simultaneoustelegraphy and telephony may be accomplished. The revenue derived from telegraph leases on long-distance tele-phone lines, in many cases equals, and quite often that de-rived from the long-distance telephone service. While this practiceis not new, its application has not been extensive, owing to themeagre knowledge of the principles, and the limited number of. FIG. I.—DI.\GR.\M OF COMBIN.\TION CIRCUIT. long-distance telephone lines. The successful operation of the systemdepends upon the proper proportion and arrangement of inductanceand capacity. The effect of high and low-frequency currents uponimpedance coils and condensers being directly opposite. The com-paratively slow vibrations of the impulses in a telegraph circuit passreadily through the impedance coils, but are almost totally obstructedby the condensers, while on the other hand, the vibrations set upby the voice in the telephone transmitter, produce in the line acurrent of very high frequency, which has a directly opposite effectupon the condenser and impedance coils arranged in the circuit. Fig. I shows diagrammatically the arrangement of the circuitwhere each side of the line is used as a separate telegraph circuit,and the two circuits or sides of the line form a metallic circuit fortelephone purposes. A represents a telephone set, B a If r represe
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
