. The Street railway journal . of G. There is another class or system, in fact, it might be called a com-bination of systems, combining the magnetic arrangement of surfacecontact with the electro-magnetic. One of these is the Siemens sys-tem. Contact plates are used, and the switching mechanism thereinconsists of a pivoted lever which is first attracted by the magnet on thecar, and after the plate has been connected the current passes around acoil of wire on the lever and magnetizes it. There is another system, devised by Lieutenant Patten, in whichpractically the same method is adopt
. The Street railway journal . of G. There is another class or system, in fact, it might be called a com-bination of systems, combining the magnetic arrangement of surfacecontact with the electro-magnetic. One of these is the Siemens sys-tem. Contact plates are used, and the switching mechanism thereinconsists of a pivoted lever which is first attracted by the magnet on thecar, and after the plate has been connected the current passes around acoil of wire on the lever and magnetizes it. There is another system, devised by Lieutenant Patten, in whichpractically the same method is adopted. The switching device is soarranged as to improve the magnetic circuit. A separate contact railis used as the contact conductor. What is perhaps the latest attempt, in the surface contact systemof the Johnson-Lundell type, is very similar to the system in which themagnetic switches are all grouped together. A sectional rail is usedinstead of contact plates. The peculiarities of this system are that the car is also equipped. THE LINEFF SYSTEM. with a storage battery, so that in case the brush under the car losescontact with any section of the contact rail, the car is simply operatedby the storage battery. The battery is also used to actuate the mag-netic switch if it should be de-energized. Other surface contact systems have also been devised by Gorden,Pollak and Binswanger, Schuckert and others. In the last named sys-tem iron fillings are used as the switching medium in the same wayas the levers are used in one of the systems described. I will not dwell on the advantage or disadvantage of the surfacecontact systems. The claim put forth by their promoters is that theydispense with the open slot, and can be installed cheaper than anysuch system. However, on the other side, we have the difficulty ofkeeping down the leakage of the section that may be alive; the compli-cated mechanism and the many parts, and the uncertainty of action December, 1894.] r THE STREET RAILWAY JOURNAL.
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
