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BELL SYSTEM TECHNICAL JOURNAL 



30 40 50 



200 300 400 500 



l.p 



5 0.4 



50 iOO ISO 200 250 300 350 400 450 500 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 10 — Mutual inductance between cable pairs in terms of value for Mo at ten 



kilocycles. 



in the same quad the average values at 10 kilocycles are 0.056 and 

 — 0.0030 microhenries. For non-adjacent pairs the values are, of 

 course, much smaller. 



Acknowledgment 

 In this work the writers received much help from Ray S. Hoyt 

 in the matter of general circuit theory. As previously noted, the 

 accuracy of the measurements was established by the work of Sallie 

 Pero Mead in developing a calculation formula for the case of straight 

 wires. 



