File:The Street railway journal (1905) (14738078516).jpg

Identifier: streetrailwayjo251905newy (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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de indicate that in the equivalent of our sub-urban service the maintenance of the bow trolley would con-siderably exceed that of the trolley wheel. A modification ofthe bow trolley, in which a roller replaces the sliding bar, hasbeen used in a number of cases, with excellent results. Wherethe trolley wire is maintained within a foot or two of uniformheight, a reversible trolley contact with a pantagraph mechan-ism, carrying a roller for contact with the wire, can readily beapplied. Where the variation in height of the trolley wire is 4 w 6 FIG. 2.—SECTIONAL ELEVATION OF RIGID FRAME TYPE OF ELEClRIC LOCOMOTIVE trolley wheel, has been considerable, on different parts of the same line, the panta- i6o STREET RAILWAY JOURNAL. (Vol. XXV. No. 4. graph construction must necessarily be of considerable size.The first electrical equipment of the Brooklyn Bridge was pro-vided with this pantagraph form of trolley, prior to the in-stallation of the third rail. Another instance of the use of this
Text Appearing After Image:
FIG. 3.—SECTIOxv OF MOTOR AIR COMPRESSOR type of trolley is on the San Francisco, Oakland & San JoseRailway, illustrated in the Street Railway Journal for Feb.20, 1904. It is customary to install two pantagraph trolleys,each collecting its share of the current, and where necessary tocollect a larger amount, as might be the case in locomotivework, additional trolley contacts may be installed to any extentrequired. A pantagraph type of trolley, provided with a shoeinstead of a roller, is well adapted for use in connection withthird-rail operation, where it is desired to make overhead con-tact through special track work or road crossings where thethird rail cannot be conveniently installed. On the New YorkCentral locomotive, this particular contact device is fitted withan air piston to provide a convenient means of depressing thecontact shoe. The ordinary methods of trolley wire suspension and insula-tion are not well adapted for high potential alternating trolleylines, and what is

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