vi 



SCIENCE.- ADVERTISEMENTS. 



Three Books Indispensable to Electricians 



Testing of Electro-Magnetic Machinery 

 and other Apparatus 



TO BE COMPLETE IN TWO 

 VOLUMES 



By BERNARD VICTOR SWENSON aud BUDD FRANKENFIELD 



University of Wigcotisin. A^ernst Lamp Company. 



Volume I. Cloth, 8vo. $3.00 net (postage 18c.). 



The field covered by the present volume is that of direct-current electro-magnetic machinery 

 and apparatus, and the book is almost exclusively confined to dynamo-electric machinery. The 

 text refers in numerous places to various books and publications so as to make the book serviceable 

 in connection with any first-class college course. This also adds to its value as a reference book. 

 Volume II., in preparation, will deal with alternating-current machinery, etc. 



" It is a book which can be thoroughly recommended to all students of electrical engineering who 

 are interested in the design, manufacture, or use of dynamos and motors ... A distinct 

 and valuable feature of the hook is the list of references at the beginning of each test to 

 the principal text-books and papers dealing with the subject of the test. The book is well 

 illustrated, and there is a useful chapter at the end on commercial shop tests."- — Nature. 



By HENRY M. HOBAET 



Electric Motors 



Continuous Current Motors 

 and induction Motors, Their 

 1 heory and Construction. 



458 pp., 8vo, illustrated, $5. 



" Readable, useful, and indispensable to elec- 

 trical engineers who are working along the same 

 lines." 



— Engineering News. 



"Probably the most complete and advanced 

 treatise on electric motors yet pul)lished." 



— Electrical Review. 



" Far and away ahead of anything thus far 

 published in English on the subject.'' 



— Anier. Electrician. 



By TURNER & HOBART 



The Insulation of 

 Electric Machines 



By HARRY WINTHROP TURNER, 



Associate A. J. E. E. and 



HENRY METCALF HOBART, 



M. I. E. E., Mem. A. I. E. E. 



V/ith 163 Illustrations. 



Cloth, Svo, $4.50 



The results of twenty years of practical work 

 with insulating materials, and of careful study of 

 their insulating properties. Probably no other 

 properties of any materials employed by engineers 

 are so indefinite as these. 



THE MACMILLAN COMPANY, Publishers, 66 Fifth Ave., N. Y. 



