. Electric railway journal . d of the line; another tapped on by 638,000 aluminum cables (equivalent to 400,000 circ. mil cop-per) to trolley wire opposite substation, and another pairof 1,192,500 circ. mil aluminum cables extending taps are located from 1000 ft. to 2270 ft. apart,with section breaks between them. With this arrange-ment of feeders, with ten cars in operation on thedivision and 600 volts emf at Aloha Street, it is esti-mated that the maximum drop would be experienced atthe outer end of the line, being about volts or cent at the furthest feeder
. Electric railway journal . d of the line; another tapped on by 638,000 aluminum cables (equivalent to 400,000 circ. mil cop-per) to trolley wire opposite substation, and another pairof 1,192,500 circ. mil aluminum cables extending taps are located from 1000 ft. to 2270 ft. apart,with section breaks between them. With this arrange-ment of feeders, with ten cars in operation on thedivision and 600 volts emf at Aloha Street, it is esti-mated that the maximum drop would be experienced atthe outer end of the line, being about volts or cent at the furthest feeder tap. Near the southerlyend the drop is less. On the initial installation, a sav-ing in first cost of more than $3,000 was made by usingaluminum instead of copper, the price per pound ofaluminum cable being cents delivered at Seattle,while copper cable was cents per pound, the totalweight of aluminum required being of course very muchless for equal conductance. SEATTLE MUNICIPAL RAILWAY—EXTERIOR VIEW OFSUBSTATION. SEATTLE MUNICIPAL RAILWAY—EXCITER END OF MOTOR-GENERATOR SET Power for the line is supplied from a single substa-tion, which was designed, in addition to its railwayfunction, also to form part of the municipal electricaldistribution system, centering in the Yesler Way sub-station at the city end of the 60,000-volt transmissionlines from the plant at Cedar Falls in the distribution from Yesler Way to the various out-lying substations is accomplished by a 15,000-volt, two-phase, five-wire system with grounded neutral. Thesubstations are transformer stations, that are usedprincipally for lighting, but also for carrying a certainamount of motor load. The lighting department isalready supplying 250-volt direct current, principallyfor elevator motors, from its Yesler Way substation, andthe addition of similar facilities in the railway substa-tion puts the department in a much stronger positionto make contracts. In consequence two 500-kw syn-
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