568 



BELL SYSTEM TECHNICAL JOURNAL 



A three-inch length of No. 18 wire was inserted as shown in the lower 

 picture of Fig. 5 and "Experimental Curve 2 " resulted. This reduced 

 the irregularities in the input impedance to about half, so another three 



648 



624 



576 



522 



336 



1.00 



Lj 3 24 



Z 312 



300 



288 



264 



1.12 



0.92 



8 10 12 14 16 18 20 22 

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24 26 28 30 



Fig. 6 — Lower. Experimental input impedance characteristics of 300 ohm line 

 with terminations shown in Fig. 5. Upper. Input impedance characteristics of 

 50-meter 600 : 300 ohm line of No. 6 conductors. 



inches were inserted, resulting in "Experimental Curve 3." Here the 

 maxima and minima are displaced, indicating that the effect of the 

 stray capacitance has been reduced to the same order of magnitude as 

 that due to the deviation of the resistance from the desired value. This 



