History of the Transformer

Chapter 2: PREFACE.

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About This Book

A concise chronological account explains how electromagnetic induction experiments gave rise to modern alternating-current transformers, moving from early induction coils to refined core-and-winding designs. The narrative connects fundamental principles—magnetic circuits, coupling, and induced electromotive force—with practical engineering aims such as reducing resistance, optimizing coil proportions and symmetry, and improving coefficient of induction. It surveys successive inventions and patent disputes, contrasts polar and non-polar arrangements, and describes how iterative refinements in core materials, winding techniques, and circuit form enabled reliable voltage transformation for lighting and power distribution.

PREFACE.

As of late the employment of alternating current transformers has largely increased and become of great importance, indeed as they are called upon to play a striking part in electric lighting from central stations, the author has thought a short notice of the development of this invention would possess some interest. This task appeared to be so much the more pressing, as many distorted versions of the invention and its priority have found place in the technical journals.

The author has not let the reading of the large number of patents discourage him, and hopes that the following plain and concise statement of these researches will contribute towards the forming of a correct judgment as to the services rendered by the several inventors.

THE AUTHOR.