. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . lb ELECTRIC KAILWAYS span-wire constriK-tion is used, the feed wire may he suhstituted forthe span wire at the pole where the connection hetween feed wireand trolley wire is made. In such a <;isr, of course, a trolley-wirehanger is used which .has no insulator, so that the current feeds Cr/K eeplnZi Note ..I Coins to be ^devp ^opoiesHake B. Fig. 69. Standard Straight Line Construction. directly through the hanger
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . lb ELECTRIC KAILWAYS span-wire constriK-tion is used, the feed wire may he suhstituted forthe span wire at the pole where the connection hetween feed wireand trolley wire is made. In such a <;isr, of course, a trolley-wirehanger is used which .has no insulator, so that the current feeds Cr/K eeplnZi Note ..I Coins to be ^devp ^opoiesHake B. Fig. 69. Standard Straight Line Construction. directly through the hanger. Another method is to nm the feed con-nection parallel with a span wire and a short distance from it. Section Insulators. Section insulators are usually placed inthe trolley wire at regular interyals. Such a section insulator isshown in Fig. 70. Its jnirpose is to insulate one section of trolley ELECTRIC RAILWAYS 77 wire from tlie iioxt, so tliat in case tlie trolley wire of one sectionbreaks, or is ifroniided in anv other maimer, that section can be dis-connected an<l llic other sections on cither side ke])t in oj) hirge city street-railway systems, each section of trolley wire nsnallyhas its own feeder or feeders, independent of the other feeder is supphed through an automatic circuit breaker at thepower house. In case a certain section of trolley wire is groimdedthe large current that immediately flows will open the circuit breakersupplying that section; but, unless the ground conta
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Keywords: ., bookauthoramericanschoolchicago, bookcentury1900, bookdecade1900
