. The Street railway journal . n until the sag in the span of 300 ft. is 6 ft. The sagin the other spans is allowed to adjust itself, since the ten-sion is the same. After being pulled up to the proper ten- clamp and a lead packing. Fig. 6 represents the main lineinsulator complete with its supporting yoke. One feature of the construction to be noted is the ar-rangement of the clamp and the collar, which is such thatin case of the breakage of the messenger cable on one sideof the insulator, the pull of the cable on the other side willcause the clamp to swing downwards, thereby lowering thepoin
. The Street railway journal . n until the sag in the span of 300 ft. is 6 ft. The sagin the other spans is allowed to adjust itself, since the ten-sion is the same. After being pulled up to the proper ten- clamp and a lead packing. Fig. 6 represents the main lineinsulator complete with its supporting yoke. One feature of the construction to be noted is the ar-rangement of the clamp and the collar, which is such thatin case of the breakage of the messenger cable on one sideof the insulator, the pull of the cable on the other side willcause the clamp to swing downwards, thereby lowering thepoint of application of the pull of the cable. Thus theporcelain is put in compression, and there is no tendency toshear off the top of the porcelain, as is usually the case withporcelain line insulators. Each porcelain is subjected inthe shop to a test of 55,000 volts when assembled. ANCHOR BRIDGE STRAIN INSULATORSFig. 7 represents the general appearance of the strain in-sulators which are used for dead-ending the catenary cables. Front Facing Track Side ViewTransverse with Track FIG. 9.—DETAILS OF ANCHORED GUY POLE sion the catenary cables are anchored to the anchor bridgesand are clamped to the insulators of the intermediatebridges. MAIN-LINE INSULATORSThe insulators which support the catenary cables of theintermediate bridges consist of heavy porcelain insulatorsof the skirt type, which are 15 ins. in diameter and about7 ins. high. These insulators are cemented upon shortlengths of double, extra strong pipe, which in turn is heldby means of U-bolts to a cast-iron yoke, bolted to the upperchords of the truss. The catenary cable rests in a groove inthe top of the porcelain and is held by means of a malleable-iron clamp fitted with U-bolts and placed one on each sideof the insulator. The head of the insulator is conical inshape and is surrounded by means of a split malleable-iron at the anchor bridges. These insulators, which are ofspecial construction, are designed to withstand
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
