. Electric railway journal . yto commercial wires within the towns along the lineof the railroad. One of the most interesting features of the prelim- I-beam about 15 ft. out from the pole. From theseI-beams is hung the longitudinal catenary construction,two suspension insulators being provided at each pointof support. Structural steel anchor bridges will beinstalled at half-mile intervals. Another general form of construction, and the onewhich is to be adopted with possibly some changes indetail, consists of a cross-catenary cable which re-places the I-beam. With this construction the polesare
. Electric railway journal . yto commercial wires within the towns along the lineof the railroad. One of the most interesting features of the prelim- I-beam about 15 ft. out from the pole. From theseI-beams is hung the longitudinal catenary construction,two suspension insulators being provided at each pointof support. Structural steel anchor bridges will beinstalled at half-mile intervals. Another general form of construction, and the onewhich is to be adopted with possibly some changes indetail, consists of a cross-catenary cable which re-places the I-beam. With this construction the polesare guyed by two IVi-in. steel rods with are attached to the pole at the point of connec-tion for the cross-catenary cables, and are anchored inback of the pole. On both curves and tangents, withthis type of construction, the high points of the longi-tudinal catenary cables are provided with horizontalsteady strains insulated from poles by double porcelaininsulators, and wooden insulators about 3 ft. long are. Philadelphia Electrification—View at End of Experimental Section of Track Showing Construction of Anchor Bridges Which Will Be Installed at Half-Mile Intervals inary engineering work introduced by the consultingengineers has been the erection of an experimental mileof overhead construction at St. Davids Station on themain line, 14 miles west of Philadelphia. Views ofthis are shown in the accompanying illustrations. Inthe experimental section, which includes all four main-line tracks, a number of different forms of catenaryconstruction have been installed, and these have beensubjected to exhaustive tests for purposes of compari-son. In all cases tubular steel poles with 10-in. buttsset in heavy concrete foundations have been used forthe main supports of the overhead system. Each poleis made up of three telescope sections with the bottomreinforced with an extra section of tubing extendingseveral inches above the top of the concrete founda-tion, thus provid
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