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 396
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… … Fig. 242. the slot of the conduit. The conductors pass up through themiddle. These plows can, of course, be removed only when thecar is over an open pit. A conduit system of thiskind is very expensive to buildbecause of the fact that a verydeep excavation must be madein the street to accommodatethe…
Electrical engineering
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