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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The present edition of Mr. Kapp's work, published originally in England, is a translation of the third German edition, which has been revised and much enlarged by the author. In this edition reference to stationary transformers has been omitted, since the matter has been fully dealt with in a separate work by the author.