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BELL SYSTEM TECHNICAL JOURNAL 



been given here. From this diagram it can be seen that with values of 

 the net drag {Fd) and lift {Fi), the normal force {F-,,), the resultant 

 force {Fr), the tangential force {Ft) and the angle (6) between the 

 resultant and normal forces can be determined through the following 

 relationships : 



(1) 

 (2) 

 (3) 



(4) 



^n = Fi sin a -\- Fd cos a — Fr cos 5, 



Fr = ^IWT~F? = ^fT+~f}, 



Ft = Fd sin a — Fi cos a = Fr sin 8, 



8 = a — arc tan -=r = arc tan -^r • 



I'd -In 



The only term in these equations which is not defined above is a. 

 This is the angle between the wire and the normal to the wind or 

 between the wind and the normal to the wire. 



The data determined through the use of these relationships are 

 given in the accompanying Tables I (0.104-inch wire) and II (0.165- 

 inch wire). The forces in these tables are given in terms of pounds per 

 foot of wire. 



TABLE I 

 0.104-Inch Diameter Wire 



