Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 271.—Direction of Momentary Induced Currents in theSecondary Circuit. each make and break of the primary. Whether the circuitsare wound in flat spirals or in cylindrical coils, Fig. 271, thesame principles apply. The induction coil, •([ 300, is con-structed on this principle. 287. Third Method.— Altering the Strength of the Pri-

Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 271.—Direction of Momentary Induced Currents in theSecondary Circuit. each make and break of the primary. Whether the circuitsare wound in flat spirals or in cylindrical coils, Fig. 271, thesame principles apply. The induction coil, •([ 300, is con-structed on this principle. 287. Third Method.— Altering the Strength of the Pri- Stock Photo

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