. The Street railway journal . ld not interfere with the d. c. trolleys. Thecenter poles are 34 ft. long, and are spaced100 ft. apart, the a. c. and d. c. trolley wiresbeing No. 000 grooved section with no feedersfor the a. c. trolley, and with a 500,000 feeder reinforcing the d. c. trolley. Thed. c. trolley conforms to standard bracket con-struction and presents no unusual features,while the a. c. trolley wire is suspended froma y%-m. steel catenary. The a. c. trolley isclipped to the catenary midway between poles,and the catenary in turn is hung over porcelaininsulators on wooden cr
. The Street railway journal . ld not interfere with the d. c. trolleys. Thecenter poles are 34 ft. long, and are spaced100 ft. apart, the a. c. and d. c. trolley wiresbeing No. 000 grooved section with no feedersfor the a. c. trolley, and with a 500,000 feeder reinforcing the d. c. trolley. Thed. c. trolley conforms to standard bracket con-struction and presents no unusual features,while the a. c. trolley wire is suspended froma y%-m. steel catenary. The a. c. trolley isclipped to the catenary midway between poles,and the catenary in turn is hung over porcelaininsulators on wooden cross-arms, the wholeforming a construction of great flexibility,with the further advantage of providing excel-lent insulation with standard porcelain insula-tors and eliminating the span wires adjacentto the trolley wire, thereby preventing the polecatching should the trolley-wheel leave thewire. This method of trolley construction is well adapted tohigh-potential high-speed work in both its electrical and me-chanical OVERHEAD CONSTRUCTION ON THE BALLSTON LINE, SHOW-ING DIRECT-CURRENT TROLLEY WIRES OVER CENTER OFTRACK, AND ALTERNATING-CURRENT TROLLEY WIRESATTACHED TO CATENARY HUNG FROM PORCELAIN IN-SULATORS ON SHORT CROSS-ARMS ON INSIDE OF TRACK August 27, 1904.] STREET RAILWAY JOURNAL. The company befieves that 2200 volts can be used as a stand-ard for most interurban railways. Where a higher voltage isrequired, the motors will be built for 3300 volts or 5500 volts. COMPARATIVE A. C. AND D. C. RESISTANCE, TROLLEY AND TRACK,PER MILE OF CIKCUIT D. A. C. Cycles _ . ° D. C. ohms ohms .318 .417 i-3i One trolley and double .167 ■259 1-55 Two trolleys and double track. .088 •155 Double track alone .OI74 .114
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
