90 LEATHER BELTING 



in Table IV find the figure that most nearly corresponds to 

 the cross-sectional area. At the head of the column read the 

 thickness of the belt. 



9. To ascertain the amount that is to be taken out of a 

 belt to restore it to its maximum tension, subtract the tension 

 in the belt before tightening from the maximum tension. 

 Find the figure corresponding to this difference at the bottom 

 of the chart Fig. 32, and run vertically upward on the chart 

 until the line corresponding to the cross-section of the belt is 

 encountered. At the left of the chart, opposite the inter- 

 section of the tension and the area so found, read the stretch 

 per 1 8 in. of length of belt. Multiply this figure by the quo- 

 tient of the length of the belt in inches divided by 18, or of 

 its length in feet divided by 1.5. The result will be the 

 amount that must be taken out of the belt to restore it to 

 its maximum initial tension. 



