Gilley, Frank M · Boston, Allyn & Bacon · leaf 508
A and E. Hold the mag-net pointing through thecentre of the coil. Revolvethe coil. The contact of one brush shifts from the half of A tothe half of E; the other brush making the opposite change at thesame instant that the current reverses in the coil. The current in the brushes and the wires… … I I Fig. 455. 498 PRINCIPLES OF PHYSICS. 576. Series Dynamo.—Replace the permanent magnet ofFig. 455 with an electromagnet connected with a battery. In a practical dynamo, a part orthe whole of the current gener-ated in the armature, C, is sentthrough the coil of the electro-magnet, MM, Fig. 466.…
Physics
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