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. (1916)
American Technical Society · Chicago : American Technical Society · leaf 395
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… … 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…
Electrical engineering
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