vi 



SCIENCE.-ADVERTISEMENTS. 



The Insulation of Electric Machines 



A ^'EW 

 BOOK NOW 

 READY 



BY 



Harry 



WlNTHROP 



Turner 



AND 



Henry 



Metcale 



HOBART 



With I02 



Illustrations 



Cloth, $4,50 



" This is the first book to be published on 

 this most important subject ... to both 

 the designer and the operator of electrical 

 apparatus, as nine-tenths of the ultimate 

 breakdowns in electrical machinery are due 

 to the breakdown of the insulation, no mat- 

 ter what the primary cause of the trouble. 

 The work of Turner and Hobart is, there- 

 fore, very timely and ... a most valu- 

 able contribution to the subject, giving, as it 

 does, the first logical and comprehensive 

 outline of the general subject . . . The 

 bibliography in one of the final chapters 

 will be found of special value to those who 

 wish to study the subject further." 



— Electrical Review. 



ALSO BY Electrie Motors 



Henry M. Hobart 



480 Illustrations Continuous Current Motors and Induction Motors: 



Cloth, $5 00 Their Theory and Construction 



'• One of the peculiarities of all text-books on the principles of dynamo design or construction, or both, 

 is the lack of adequate information regarding motors; the present volume, therefore, is amply justitied, 

 and, as might have been expected by reason of the author's high standing as a designer, it represents a 

 very efficient elfort to supply the deticit in its class of literature . . . The book is far and away ahead 

 of anything thus far published in English on the subject." — American Electrician. 



BY 



I^adio= Activity 



Professor E. 



Rutherford " ^^"^^^^ ^ book cannot fail to be of great service 

 to scientific students." 

 Goth $3.50 net [postage 13c.) — Queen'' s Quarterly. 



Harold A. Wilson writes in Nature : " The book is not of a popular character ; it is intended for those 

 who wish to study the subject scientifically, possibly with the view of undertaking research work on it. 

 For such students it is admirably adapted, and possible openings for research work are suggested implicitly 

 or explicitly on almost every page. Such a work cannot fail to be of great service to scientific students . 



. The arrangement of the matter and its treatment are throughout admirable." 



The Macmillan Company, Publishers - - - 64-66 Fifth Avenue, New York 



