Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . 349 252 ELECTRIC RAILWAYS the two sides are held together by the metal which has flowedthrough holes in the rail webs. SPECIAL TRACK CONSTRUCTION Underground Conduit System. The underground conduit sys-tem, in which the conductors conveying the current to the cars arelocated in a conduit
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . 349 252 ELECTRIC RAILWAYS the two sides are held together by the metal which has flowedthrough holes in the rail webs. SPECIAL TRACK CONSTRUCTION Underground Conduit System. The underground conduit sys-tem, in which the conductors conveying the current to the cars arelocated in a conduit under the tracks, is in use in two cities of theUnited States—New York City and Washington, D. C. Thecost of this system, and the danger of interruption of the servicewhere the drainage is not excellent, have prevented its moreextensive adoption. The New York type of conduit, which is agood example of this construction, is shown in cross-section inFig. 241. The conductors consist of T bars CC of steel, sup-ported from porcelain cup insulators located 15 feet apart inthe conduit. At each insulator a handhole is provided. Fig. 242,. Fig. 241. Conduit for Underground Trolley System to furnish access to the insulator from the street surface. Man-holes are provided at intervals of about 150 feet, so that thedirt which collects in the conduit can be scraped into these man-holes and removed at intervals. The manholes also serve as pointsof drainage connecting with the sewer system. Current is con-ducted to the car through a pair of contact shoes commonly calleda plow, which has the two shoes insulated from each other andfrom the frame of the plow. These shoes are provided withflat springs that hold them against the conducting bars in theconduit. The shank of the plow is thin enough (tb inch) to enter 350 ELECTRIC RAILWAYS 253
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