MOTION OF TELEPHONE WIRES IN WIND 



361 



20 40 60 80 100 



WIND VELOCITY IN MILES PER HOUR 



20 40 60 80 100 



WIND VELOCITY IN MILES PER HOUR 



SPAN OF 130 FEET 

 Fig. 5-^. 



SPAN OF 200 FEET 



Fig. 5-B. 



