658 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1951 



These objectives were not realized with the hoped-for finesse, because of 

 difficulty encountered in filling the interstitial air space with DXL-1. Both 

 vacuum and pressure injection methods were tried, and the best that was 



Cmut 



0.32 0.34 



0.38 0.40 0.42 



S/D 



0.44 0.46 



Fig. 2— Cg/Cn,ut as a function of d/2S. S/D. 



Obtained was a cable with from 85 to 90% of the interstitial space filled 

 with DXL-1, or about 9?> to 95% of the total dielectric space filled with poly- 

 ethylene. These percentages are based on the measured increase in cable 

 weight as a result of filling with DXL-1, and the air volume before filling cal- 

 culated from nominal insulated conductor and core diameters. Evidently 



