Identifier: cyclopediaofappl00ameruoft (find matches)
Title: Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity
Year: 1905 (1900s)
Authors: American School (Chicago, Ill.)
Subjects: Electric engineering
Publisher: Chicago : American School of Correspondence
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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scent lamp inside the case lights automatic-ally when the receiver is writing and may be lighted by pressinga button at other times, thus providing for visibility at night.Fig. 3 shows the army ty))e of receiver mounting. On warshi))s there is a somewhat simihir service to be ren-dered and the performance of this should fall to the army type oftelautograph. Commercial service has given opportunity for the installationof a considerable number of private line telautographs in actualuse, and at least three of each of the other typical installations arein operation at the present time. Much of the improvement in details of construction and reli-ability in operation has resulted from ex))erience gained in effortsto perfect the service of these commercial plants. The experienceleading up to the special army type of telautograph has extendedover a period of about five years and in the present instrument allthe requiivments. unusually severe as they are, have been success-fullv fuliilled. 880
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OS •^- i o ^- Q «= o § I 2 o s ^ o t, INSULATORS FOR TRANSMISSION LINES. T.iiie iusulators, pins, and eross-arnis all go to make up pathsof nioi-e or less conductivity l)et\veen tiie wires of a transmissioncircuit. The amount of current tlowing along these paths fromone conductor to another in any case will depend on the combinedresistance of the insulators, pins, and cross-arm at each pole. As a general rule, the wires of high-voltage transmission cir-cuits are used bare because continuous coverings would add materi-ally to the cost with only a trifling increase in effective insulationagainst high voltages. In some instances the wires of high-pres-sure transmission lines have individual coverino-s for short dis-tances where they enter large cities, but often this is not the case.At Manchester, New Hampshire, bare conductors from water-powerplants enter the substation, well within the city limits, at 12,000volts. From the water power at Chambly the bare 25,000-voltcircuits, after

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