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 359
rnating cur-rent are usually repre-sented diagramati-cally. For example,suppose an alternatingcurrent of 5 amperesto flow for one second in a positive direction, and then be automatically reversed and flow for one second in the opposite or negative direction, and reversed again, this cycle of… … Fi-. 309.—Students Experimental Dynamoand Motor. oO
Electricity · Magnetism
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