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By Benjamin G Lamme

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Will be in brick compartments separate from the board. In each generator circuit there are two non-automatic oil-break switches in series; and on each feeder circuit there are two overload time-limit oil-break switches in series. The two oil-break switches in series on the same circuit can be closed separately and then opened to test the switches without closing the circuit. With the switches in the closed position they are both operated" ELECTRICAL ENGINEERING PAPERS 50 same time by the controller, to ensure opening of the cirand to put less strain on the switches, although either one at the cuit, There will be nine transformer capable of opening the load Each station the substations distributed along railway line.

When the A. c. system applied to interurban and lines steam railway systems finally becomes of predominant importthe existing D. c. railways will gradually that probable be changed to A. c.

Motors in tandem, or series-parallel. Secondary run as single-phase. Varying the resistance of the secondary. Varying the electro-motive force of the primary, with constant secondary resistance. of these methods are the speed is efficient, while some are very in- to be varied over a wide range. VARYING THE NUMBER OF POLES The first method, varying the number of poles, is efficient to a certain extent, but is limited in the number of combinations of THE POLYPHASE MOTOR poles obtainable. may 27 But if combined with some of the other methods be made It consists in fairly effective over a wide range.

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Electrical Engineering Papers by Benjamin G Lamme


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