PREFACE 



INCREASED activity in the development of our water-power 

 resources is certain to take place in the near future, because 

 of the rapid and general increase in power demands on the central 

 station systems, and because of the increased cost and shortage of 

 fuel. A book, therefore, dealing with the many phases of this 

 subject from a practical and up-to-date engineering standpoint, 

 will be of great benefit, not only to those who have been actively 

 engaged in such development work, but also to those who may 

 desire to enter it in the future. 



The work of planning, building, operating a hydro-electric 

 power development requires a full understanding of the economic 

 factors which enter into the problem, and a thorough knowledge 

 of both the hydraulic and the electrical engineering sides of the 

 subject. Any book to be complete, must, of necessity, cover all 

 these branches. Limited space, however, makes it impossible to 

 deal with minor details, and the book is not intended as a treatise 

 on the design of individual structures, machinery and apparatus 

 which go into the makeup of a power station. Many books have 

 been written dealing with such detailed designs, and manufac- 

 turers should be freely consulted. This book deals with and 

 explains the problems which must be solved in connection with 

 the construction and management of a hydro-electric power' 

 station, so that the manager or engineer may select power equip- 

 ment and fully understand the economic factors which enter into 

 each individual situation. The authors have endeavored to 

 describe the most recent engineering practice and they have 

 included a considerable amount of information not available 

 hitherto. 



This is an educational treatise for the student and operating 

 man and the manuscript has been submitted to experts in the 

 various branches of the subjects treated. 



It is believed that a study of this volume will result in improving 

 the service and operating efficiency of many systems. 



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