Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 358
. M. F. of 4 volts. Exp. 91: Separately excite the magnets (connected in seiies) of thestudents experimental dynamo, Fig. 309, so that one j)ole piece A\illbe N and the other S, and adjust the brushes so that they will bearlightly upon the collector rings. Connect the brushes to the… … 308.—Simple Alternating CurrentDynamo. Direction of current in the coil at one-half revolution from the position in Fig. 307. Brush M is now negative. 340 PRACTICAL ELECTRICITY. (c) Turn the coil to the vertical position, break the field circuityand note the galvanometer deflection ; make the field…
Electricity · Magnetism
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