POLYETHYLENE INSULATED TELEPHONE CABLE 



1255 



ff, 6 



UJ 4 

 Q 



Z 



g 



z 



20 40 



60 



80 100 120 140 160 180 200 220 240 260 280 300 

 FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 7 — Attenuation versus frequency. 19-gauge cables having 0.066 yi per mile 

 capacitance. 



10 15 20 25 30 35 40 45 50 55 60 

 PER CENT AIR BY VOLUME IN CONDUCTOR INSULATION 



65 70 



Fig. 8 — Change in cable diameter with degree of expansion of polyethylene 

 conductor insillation. 19-gauge 51-pair cable, 0.066 tii per mile capacitance. 



