242 



BELL SYSTEM TECHNICAL JOURNAL 



The result is a loss of energy which introduces resistance in the cable 

 circuit, this resistance being much greater than if the armor wires 

 were absent.^ 



The relations between sent and received voltage for some of the 

 cables which have been laid are shown by the curves in Fig. 4, in which 



2 40 60 



CYCLES PER SECOND 



Fig. 4 — Received voltage-frequency curves 



the dotted curves give these ratios for zero sending voltage, obtained 



by extrapolation. These curves were obtained experimentally from 



the laid cables. 



'See Carson and Gilbert, Journ. Franklin Institute, Vol. 192, pp. 705-735, 1921; 

 Electrician, Vol. 88, pp. 499-500, 1922; B. S. T. J., Vol. 1, pp. 88-115, July 1922. 



