WENTWORTH AND HILL'S 



PHYSICS (Revised Edition) 



By G. A. WENTWORTH, formerly Professor of Mathematics in Phillips 



Exeter Academy, and G. A. HILL, formerly Assistant 



Professor of Physics in Harvard University 



I2mo. Half leather. 480 pages. Illustrated. List price, $i. 15 ; 

 mailing price, $1.25 



WENTWORTH AND HILL'S PHYSICS aims to give a 

 rational explanation of the more important physical phe- 

 . nomena, and to prepare the way for further investigation 

 and study of physical science. 



It gives so much of the subject as should form a part of the 

 programme of every secondary school, and no more. The laws 

 and principles are stated as clearly as possible and in such order 

 that one naturally leads to the next. The experimental methods 

 by which the laws were established are given, but as briefly as is 

 consistent with clearness. The aim is to form scientific habits of 

 thinking, rather than merely to impart knowledge. 



Laboratory experiments, requiring simple apparatus only, are 

 described for the purpose of verifying laws previously stated, not 

 for discovering laws. Many numerical exercises are introduced 

 into each chapter for practice in applying the principles of physics 

 to the common problems of life. Review questions are given at 

 the end of every chapter. 



In the present edition the work has been thoroughly revised in 

 order to bring it into harmony with the latest scientific thought. 

 Special attention has been given to electrolysis, and the sections 

 dealing with this subject have been rewritten in order to bring 

 them down to date. 



A new chapter on some of the applications of physics has been 

 added. It is fully illustrated and describes the uses of compressed 

 air, artificial refrigeration, liquid air, water-tube boilers, steam 

 turbines, gasoline engines, electric furnaces, wireless telegraphy, 

 and Rontgen rays. 



GINN & COMPANY PUBLISHERS 



