COMPARISON OF FORMULAE 9 



ured and be taken up, that is, shortened in order to tighten 

 them, at such intervals as would prevent their stretching to 

 a point where they would fail to do the work demanded of 

 them. It also furnishes insurance that the belt will not break 

 while in use, and thus stop production. This feature of the 

 belting problem is every bit as important as correct original 

 design, and the necessity of regular inspection and main- 

 tenance cannot be too strongly impressed upon the factory 

 manager. The details of the system are set forth in Chapter 

 V, devoted to belt maintenance. 



The practical conclusions of Taylor and the mathematical 

 deductions of Barth, which have resulted in the system of 

 practice set forth in this book, have been amply justified by 

 the results attained in the many factories that have adopted 

 this practice. Notwithstanding that the first cost of the 

 belts may be higher than it was under the older systems, 

 or lack of system, the total cost of belting measured over a 

 period of years has been far below that which obtained when 

 the practice of light belts and high tensions was followed. 



