. Electric railway review . t particular section. All bridges are placed at a fixed distance of 300 feet curves guide poles are provided from which pull-overwires are attached and secured to the catenary spans. The general appearance of the standard 4-track inter- August 17, 1907. ELECTRIC RAILWAY REVIEW 189 mediate bridge is shown in tlie illustrations. It consists oftwo supporting side posts and a horizontal truss. Each sup-porting post is approximately 38 feet long by 1 foot 10 inchessquare. The cross truss is attached by means of bolts tothe vertical posts, allowing a distance of
. Electric railway review . t particular section. All bridges are placed at a fixed distance of 300 feet curves guide poles are provided from which pull-overwires are attached and secured to the catenary spans. The general appearance of the standard 4-track inter- August 17, 1907. ELECTRIC RAILWAY REVIEW 189 mediate bridge is shown in tlie illustrations. It consists oftwo supporting side posts and a horizontal truss. Each sup-porting post is approximately 38 feet long by 1 foot 10 inchessquare. The cross truss is attached by means of bolts tothe vertical posts, allowing a distance of 23 feet 4 inches fromthe lower side of the truss to the top of the rails. The trussis 4 feet 6 inches deep from back to back of the upper andlower chord angles, which latter are placed 1 foot 10 Inchesfrom back to back. The extensions of the side posts above the trusses areutilized for supporting the feeder wires. In the calculation of these bridges very heavy weatherconditions were assumed and provision was made for clamp-. New York New Haven & Hartford Electrification—Top ofAnchor Bridge. cause the clamp to swing downwards, thereby lowering thepoint of application of the pull of the cable, so that the porce-lain is put in compression and there is no tendency to shearoff the top of the porcelain, as is usually the case with porce-lain line insulators. Each porcelain stands a shop test ,000 volts assembled. Strain Insulators. The insulators which are used for dead-ending the cate-nary cables at the anchor bridges are designed to stand ashop test of 50,000 volts and a working load of 20,000 of these insulators is provided in each catenary cable ateach anchor bridge, thereby dividing the road into separatesections between the anchor bridges. The guy-pole strain insulator is somewhat similar inappearance to the well-known giant strain, except that it ismuch larger and is designed to stand a test of 50,000 voltsand a mechanical pull of 15,000 pounds. Insulating Se
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
