PREFACE 



THE advantages of constant- voltage transmission, in 

 improved operation and lower cost, have been recently 

 proved by actual examples, among them that of the 

 longest transmission line yet built. The practical suc- 

 cess of the method justifies the statement that the use of 

 synchronous motors has been far too limited in the past. 



It is the purpose of this book to urge that more 

 synchronous motors be installed in alternating-current 

 power systems, and that dependence be placed on them 

 to secure the desirable results of controlling the voltage 

 of lines at the opposite end to that of usual practice, and 

 of more than doubling the power load of most lines. In 

 this way, the installation of comparatively inexpensive 

 machines can take the place of building entire duplicate 

 transmission lines. 



The decision regarding such important changes in 

 design and operation, even when the examples described 

 are kept in view, must be made according to thorough 

 predeterminations of cost and operating characteristics. 

 Working formulas, with examples, are given for these 

 comparatively new calculations. 



Although the writer is in favor of the increasing use 

 of the principles of constant- voltage transmission, both 

 in long-distance work and local distribution, he has tried 

 to show impartially both sides of the case, and to outline 

 the conditions where the new method is not applicable. 



References and acknowledgments to other discus- 

 sions of this subject will be found in Chapter VII. 



H. B. D WIGHT. 



HAMILTON, CANADA, 

 June, 1914. 



