File:The Street railway journal (1904) (14573124859).jpg

Identifier: streetrailwayjo231904newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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about 1500 ft. OVERHEAD CONSTRUCTIONConsiderable care was taken in planning a suitable insulatorfor carrying the trolley wire, and Fig. 1 shows the constructionof the annealed glass insulator used. Fig. 2 shows a typical arrangement of the straight line over-head construction, and it will be noticed that wood is used forthe pole, cross-arm and braces, and that the insulator is sup-ported by means of a short span wire from iron brackets se-cured to the wooden cross-arm. This construction insured ahigh insulation at a low first cost, the entire line having beenconstructed for but a slightly increased expense over the costof standard construction, and at the same time so built that in case of failure of the alter-nating-motor system the stand-ard direct-current motor sys-tem could be put into servicewithout changing any parts,even holes for the pins for car-rying the extra feeders whichwould be required were pro-vided, as shown. It will thus be seen that theline and track work were con-
Text Appearing After Image:
1 1 I n —J \ \ J SPECIAL INSULATOR USED structed in such a manner that no expense was incurred for anyparts which would not be required for standard constructionin case it became necessary to ultimately adopt the standarddirect-current motor system; the entire idea in the constructionof the road being to save first cost and to invest all that wasinvested in such a manner that all material purchased wouldbe utilized in case either system were adopted, and should thealternating system prove successful the additional investmentfor a direct-current motor system need not then be installed. The working conductor was placed 22 ft. above the top of therails in order that trainmen, when standing upon the tops of thefreight cars going over the road, could not come in contactwith the working conductor. It was planned to operate the entire road from a single 0000trolley wire, and with one rail bonded as hereinbefore men-tioned ; this amount of copper being sufficient to operate four40-ton cars

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