vi TRANSLATOR'S PREFACE 



paper of 1900. The new matter consists of three chapters by Prof. 

 Blondel, and a chapter contributed by Prof. C. A. Adams. Part III 

 contains the reprints of the two papers presented by Prof. Blondel 

 at the St. Louis Electrical Congress in 1904, relating to the applica- 

 tion of his " two-reaction " method to alternators. 



A very few modifications and additions have been made in the 

 text by the translator. His own strong objections to the terms 

 " wattless " and " watted " made him very willing to eliminate them; 

 and the recent action of the Standards Committee of the American 

 Institute of Electrical Engineers in sanctioning and recommending 

 " reactive " and " active " as substitutes, furnished the incentive 

 and the pretext for doing this, even after a considerable portion of 

 the type had been set. This book will, therefore, be the first book 

 in which " wattless " and " watted " are replaced by " reactive " and 

 " active " respectively. 



The translator desires to express his gratitude and sincere thanks 

 to all who have encouraged and assisted him in the preparation 

 of this book for the press. Special acknowledgment should be made 

 of the very valuable services rendered by Prof. C. A. Adams. He 

 was the first to suggest the publication of this book, and he has 

 made many excellent suggestions, besides contributing two new 

 chapters, and also reading and correcting the proofs of the entire 

 book. Special thanks are also due to Prof. E. J. Berg, of the Univer- 

 sity of Illinois, for his very thorough reading of the proofs of Part I, 

 and for very excellent suggestions for changes and additions made 

 by him, some of which are incorported in notes inserted in the text, 

 and identified by the initials " EJ.B." Thanks for reading the 

 proofs of Part I, and making corrections or suggestions are due to 

 the following: 



Prof. D. C. Jackson, of Massachusetts Institute of Technology; 

 Profs. W. I. Slichter and Morton Arendt, of Columbia University; 

 Prof. H. H. Norris, of Cornell University; Mr. A. L. Jones, of the 

 General Electrical Company. 



Thanks are due to Mr. C. W. Stone, of the General Electric Com- 

 pany, and Mr. W. S. Rugg, of the Westinghouse Electric and Manu- 

 facturing Co., for the data relating to American Synchronous Motors, 

 given in Appendix B ; and also to the Edison Illuminating Company 

 of Detroit, Mich., and to Mr. A. A. Meyer of its engineering depart- 

 ment, for the information relative to the practical use of synchronous 

 condensers contained in Appendix C. 



