HOW TO USE THIS BOOK 



THE shop engineer, the master mechanic, and the man in 

 charge of the belts in the shop will find Chapters III, V, and VI 

 and the tables in the back of the book of the greatest service. 

 These contain all the necessary information for the selection 

 of the proper size of belts to transmit a given horsepower, the 

 tension at which they should be operated, the length of time that 

 should elapse between retightenings, and notes on the proper 

 care and maintenance of belts. 



For the proper arrangement of pulleys and the laying out 

 of belt drives the notes in Chapter VIII will be of service. 



The theory on which the practice given in the foregoing 

 chapters is based will be found in Chapters I and IV. This is 

 of interest to the student and the teacher, but is not necessary 

 for the practical man. 



The history of the experiments on which both theory and 

 practice are based is presented in Chapter II. 



The shop man will also find Chapter VII of value, as it con- 

 tains information regarding the quality of belting, methods of 

 utilizing old belting, recipes for belt dressings, etc., belting 

 mathematics of use in the shop, and other practical information. 



