File:The Street railway journal (1896) (14781484303).jpg

Identifier: streetrailwayjo121896newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ch reduces thepressure to about 4000 volts. This is brought down to2000 volts in thirty-two transformers, each of twenty-fivekilowatts capacity, and the current is turned into theunderground network of concentric cables, which distrib-utes it over the Roman streets for incandescent and arclighting. In addition to the transformers used for lightingpurposes, a set has also been installed in which the alter-nating current is transformed down to 400 volts. At thispressure it enters the collector rings of a number of rotaryconverters, and issues from the commutator side, directcurrent at about 550 volts. The equipment of the substation is completed by anextensive battery of Tudor accumulators, 304 in number,with a capacity of 1000 ampere-hours. This battery is inparallel with the trolley circuit and is divided into linegroups of twenty-six cells each. Each group is connectedto an automatic switch, which by cutting cells in and out,maintains the pressure constant on the street car line. The
Text Appearing After Image:
VIEWS ABOUT THE ELECTRIC RAILWAY IN ROME, ITALY. 512 STREET RAILWAY JOURNAL. (Vol. XII. No. 9. continuous current side of the converters is so connectedat the switchboard that the cells are in constant receipt ofthe excess of current and thus tlie necessity for a specialcharging djnanio is obviated. The load on the continuouscurrent machines is also kept constant by means of theequalizing action of the storage battery. The railway line is about two miles long, runs fromthe Railway Station as far as the Piazza San Silvestro, andpractically connects the old city to the new Rome. Thegrades are numerous and severe and range from .35 percent near the station to 2.6, 7 and 8.32 per cent near thePiazza San Silvestro. The curves are also numerous, thesharpest, with a radius of 78 ft., occurring at a point onthe line where the grade is 8.32 per cent. The trolley wire depends from span wires which in afew places are carried between ornamental poles, but forthe most part attached to ornamental r

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