Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 358
E. M. F. of 4 volts. Exp. 91: Separately excite the magnets (connected in series) of thestudents experimental dynamo, Fig. 309, so that one pole piece Avillbe N and the other S, and adjust the brushes so that they will bearlightly upon the collector rings. Connect the brushes to the… … Fig. 308.—Simple Alternating CurrentDynamo. Direction of current in the coil at one-half revolution from the positiou in Fig. 307. Brush M is now negative. 340 PRACTICAL ELECTRICITY. (c) Turn the coil to the vertical position, break the field circuit,and note the galvanometer deflection ; make the…
Electricity · Magnetism
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