36 



LEATHER BELTING 



through which the body moves, and g is the acceleration due 

 to gravity. 



A belt passing around a pulley develops this centrifugal 

 force which appears as a tension in the belt whose effect 

 is to diminish the tensions in both the tight and slack strands. 

 If T c be the tension due to centrifugal force, in pounds per 

 square inch of section of belt, then the tension in the tight 

 and slack strands will be (Ti T c ) and (Tz T^ respectively. 

 In the formula on page 35 W is the weight of the belt on 



FIG. 6. ACTION OF CENTRIFUGAL FORCE. 



the semi-circumference of a pulley. If w be the weight of 

 i cu. in. of belting, then for a strip of belting i in. wide and 



i in. thick 



W = 1 2-wirR. 



If v is the velocity of the belt in feet per minute, then 



17 A T72 



V = and V 2 = . 



60 3600 



general formula we have 



F = 



Substituting these values in the 



