594 



BELL SYSTEM TECHNICAL JOURNAL 



empirical curve of the resistance of smooth wires to winds normal to the 

 wire. In preparing this curve equation (5) was rewritten in terms of 

 Iho total force on a diameter length of wire, namely 



(5a) I-\ = ,VW-S(j~y 



Then Fc/pV'D^ was plotted as the ordinate and logio {VD/v) as the 



30 40 50 60 



ANGLE a IN DEGREES 



Fig. 3— Graphic relation between the force (Fn) normal to the wire and the angle (a) 

 of wind direction from normal — 0.104-inch diameter wire. 



abscissa. If the normal wind data obtained in the studies of Bell 

 Telephone Laboratories were consistent with those given in this 

 Report No. 102 ^ a plot of the points determined through the use of 

 equation (5a) should lie reasonably close to this curve. Figure 5 

 gives this curve and a plot of the normal wind results. These points 

 appear to show satisfactory agreement. 



