Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 743
hops, encountered a special difficulty in practice. Thedirt, sticking to the rails and felloes of the wheels, formed a sortof insulating crust, which prevented a sufficiently good contactbetween the car and the rails to permit of the latter serving as areturn conductor. Mr. Siemens was compelled,… … Fig. 475. necessary appliances were at last successfully devised and exe-cuted, and the system of movable contacts, practically employedfor the first time upon the Place de la Concorde, was entirelysatisfactory. We will first describe this system, and point outafterward the particularities which…
Electrical engineering
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