vi SCIENCE.-ADVERTI8EMENTS. 



Testing of Electro-Magnetic Machinery 

 and other Apparatus 



TO BE COMPLETE IN TWO 

 VOLUMES 



By BERNARD VICTOR SWENSON and BUDD FRANKENFIELD 



University of Wisconsin. Nernst 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 book 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. 



Elements of 

 Electromagnetic 

 Theory 



By S. J. BAR NETT, Ph.D. 



Leland Stanford Jr. University. 



480pp., 8vo, P 00 net [postage SOc.) 



"A profound and meritorious mathematical 

 work." — The Nation. 



" The treatment is elegant throughout." 



— Physikalische Zeitschrifl. 



" The work has long been needed and is a welcome 

 addition to our literature on mathematical physics." 



— American Journal of Science. 



"Systematic, definite, rigorous, and moderu." — 

 Electrical Review ( London ) . 



Modern Theory 

 of Physical 

 Phenomena 



RADIO-ACTIVITY, 

 IONS, ELECTRONS 



By AUGUSTO RIGHI 



Professor of Physics in the University of Bologna. 



Authorized Translation by 



AUGUSTUS TROWBRIDGE 



Professor of Mathematical Physics in the 

 University of Wisconsin. 



Cloth, 12mo, $1.10 net (postage 9c.) 



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



