. Electrical world. inging generators,which become accidentally grounded or which are permanentlygrounded. This trouble could be remedied by using a special gen-erator at the terminus of the Morse lines, if it was not for the factthat the same circuit is often connected to other long-distance tele-phone lines, which extend to scores of other offices, any one ofwhich, by ringing with a grounded generator, interferes with thetelegraph service. A third objection is that unless condensers areused between the impedance coil and the terminus of the line onthe tollboard, the Morse circuit is liable t
. Electrical world. inging generators,which become accidentally grounded or which are permanentlygrounded. This trouble could be remedied by using a special gen-erator at the terminus of the Morse lines, if it was not for the factthat the same circuit is often connected to other long-distance tele-phone lines, which extend to scores of other offices, any one ofwhich, by ringing with a grounded generator, interferes with thetelegraph service. A third objection is that unless condensers areused between the impedance coil and the terminus of the line onthe tollboard, the Morse circuit is liable to become grounded, andinterfere with the telegraph service by a telephone operator con-necting this circuit with another long-distance line, which is acci-dentally grounded. The last two conditions can be eliminated byterminating the telephone lines, which are also used for Morse workon smaller size jacks on the tollboard, and using connecting cords,which have repeating coils in circuit, and which terminate on large. FIG. 16.—TROUBLE DISTRICT. FIG. 17.—REPEATER AND SWITCHING STATION, THOMPSON S CORNERS, O. wire, most generally by the telegraph. Fig. 11 shows view of aticket wire operator sitting at the rear of tollboard, making appoint-ments and ordering up telephone connections by telegraph. Fig. 2 shows another method of using a telephone line for tele- and small-sized plugs. This slightly interferes with the rapid han-dling of telephone traffic and cuts down the talking efficiency of theline, to some extent, but effectually prevents interference to the tele-graph service. April 2, 1904. ELECTRICAL WORLD am. ENGINEER. 639 Fig. 3 shows the use of a repeating coil for deriving a telegraphcircuit from a telephone circuit. This system possesses the advantageof operators being able to signal each other with an ordinary gen-erator, providing it has sufficient voltage and output, and there isno interference to the telegraph service in case the derived line is-nnnected with a lin
Size: 1847px × 1353px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
