vi PREFACE 



Therefore, the study of the application of the scientific prin- 

 ciples underlying modern industry is worthy to be treated 

 as a special subject. 



The author believes that there is a place for the traditional 

 courses in chemistry, physics, and biology in the regular high 

 school, in addition to the first-year science course. He also 

 believes that there is a type of mind in our intermediate and 

 secondary schools that can profit by the study of the prin- 

 ciples of science underlying the fundamental trades. A 

 course of this kind should develop in a boy's mind that atti- 

 tude of alertness toward theory on which all sound practice is 

 based a mental attitude which will be valuable to all manual 

 workers, and particularly to those who are to enter the dis- 

 tributive or productive spheres of industry. Hence the title 

 of this book, " Applied Science for Metal- Workers," the 

 purpose of which is to provide an elementary course in applied 

 science for the metal trades. 



The author wishes to express his thanks to the following 

 firms who have kindly furnished cuts and information : Dodge 

 Sales and Engineering Company, The Lincoln Electric Com- 

 pany, The American Injector Company, Brown and Sharpe 

 Manufacturing Company, Tolhurst Machine Works, Buffalo 

 Forge Company, Bailey Meter Company, Novo Engine Com- 

 pany, Nicholson File Company, The Bigelow Company, 

 Ingersoll-Rand Company, Bab cock and Wilcox Company, 

 American Steam Gauge and Valve Manufacturing Com- 

 pany, The L. S. Starrett Company, Norton Company, Millers 

 Falls Company, James B. Clow and Sons, Watson Stillman 

 Company, American Radiator Company, Whitall Tatum 

 Company, Youngstown Sheet and Tube Company, Eber- 

 hard Faber, David Williams Company, American Screw 

 Company, Enterprise Manufacturing Company, Edison 



