Identifier: americanaunivers14newy (find matches)
Title: The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world
Year: 1908 (1900s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : Scientific American Compiling Dept.
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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in series or in multiple, which speedchanges are accomplished by means of a con-troller. These features are common to all elec-tric systems and the differences between thevarious systems consist in the methods used intransmitting the current from the power plant tothe car. The systems in use may be classedunder the following heads: (a) Overhead trol-ley; (6) third rail; (c) underground openconduit; (o. JoMiles operated by steam power... 169 SiAllies operated by cable power... 240 V)
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1. Grip. 2. Slot rail. 3. Track rails. 4. Carrying pulley. Fig. I.— Cross-section s! lack of flexibility in operating cable lines in con-nection with lines having other motive power,the liability to long and expensive blockadesthrough the breaking of a cable or an accidentto the winding machinery. Electricity.— The application of electricity forthe propulsion of street cars consists in drivingthe car axles with motors geared directly tothem. These motors rini on direct current ofbetween 500 and 600 volts pressure and are con-lertcd in parallel between two conductors.Mtcrnating current motors for this class of^■rk are not yet in practical operation. Themotors are series wound and have a steel howing cable construction. Overhead Trolley.— This is the comminimethod of operating electric roads. A copperwire or trolley wire, as it is called, is sup-ported directly above the centre of the trackand at an elevation of about 18 feet alxive therails. This wire is supplied with current a

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