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SCIENCE-ADVERTISEMENTS 



Just Published 



Principles and Practice 



of 



Electrical Engineering 



By ALEXANDER GRAY 



Assistant Professor of Electrical Engineering, McGill University, 

 Montreal, Canada; Author of "Electrical Machine Design" 



Sgs pages, 6x:g, 44g illustrations. 



$3.00 {is/6) net, postpaid 



A new textbook that is becoming 

 rapidly the standard on fundamentals. 

 It was published October 1,1914. It has 

 been adopted already in more than a 

 score of engineering colleges. Among 

 these are Harvard, Eensselaer, Wiscon- 

 sin, U. of Penn., Cincinnati, Pittsburgh, 

 Virginia, and Syracuse. 



Prof. Gray has apparently struck the 

 right note. He covers the entire field ; 

 emphasizes fundamental principles and 

 develops the subject by elaborating on 



these principles rather than by the solu- 

 tion of mathematical formulae. It is 

 unique, we understand, in its constant 

 regard for the student's point of view. 



The work is based on the author's 

 wide teaching and practical experience. 

 In treatment, it is as distinctive as his 

 " Electrical Machine Design," which has 

 become in less than two years the stand- 

 ard work — used in nearly 50 technical 

 schools and by practicing engineers 

 generally. 



New ncQraw=Hill Books in Chemistry and Physics 



Laboratory Course in 

 Electrochemistry 



By Oliver P. Watts, Ph.D., Assistant 

 Professor of Applied Electrochemistry, Univer- 

 sity of Wisconsin, j 148 pages, 4| x 74, illustrated. 

 $1.00. 



Quantitative Analysis 



By Edward Q. Mahin, Ph.D., Associate By William B. Anderson, Ph.D., Pro- 



Professor of Chemistry, Purdue University, feasor of Physics, Oregon Agricultural .College. 

 510 pages, 5ix 8, 119 illustrations. $3.00. 341 pages, 6 x 9, fully illustrated. $2.00. 



Send for the New 1914-15 Catalogue— Over 750 Titles 



McGRAW-HILL BOOK COMPANY, Inc. 



Principles of Electrical 

 Measurements 



By Arthur W. Smith, Ph.D., Junior Pro- 

 fessor of Physics, University of Michigan. 256 

 pages, 6 X 9, illustrated. $2.00. 



Mechanics and Heat 



