May 



IS /Q05 



SCIENCE 



New Series. 



Vol. XXI. No. 541. 



Friday, May 12, 1905. 



Single Copies, lb Cts. 

 Annual Subscription, $5.00. 



The Insulation of Electric Machines 



.4 NEW 

 BOOK NOW 

 READY 



BT 



Harry 



WiNTHROP 



TUR^s^ER 



AND 



Henry 



Metcaef 



HOBART 



With I02 



Illustrations 



Cloth, 4.50 



" This is the first book to be pubUshed on 

 tills 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. 

 'Che 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 



Henry M. Hobart 



480 Illustrations 

 Cloth, $500 



Electric Motors 



Continuous Current Motors and Induction Motors 

 Their Theory and Construction 



BY 



Professor E. 



Radio= Activity 



^ ' ' Such a book cannot fail to be of great service 



Rutherford . , , . 



to scientific students." 

 Cloth $3.50 net {postage 13c.) —Queen's Quarterly. 



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



