332 



KENNELLY-NABESHIMA— ESTABLISHING A 



0.0631/85° 25' 8" = (5.058 + y 40^) 10-3 hyps Z. 



Linear angle a at 60.6'—', 



1.307 X 10-3/85° 25' 8" = (0.1048 + y 1.302) 10-3 



= (0.1048 + y 0.8293) 10-3 hyp/km. 



Linear angle a at 60.6^ — ', 



2.103 X 10-3/85° 25' 8" = (0.1686 + y 2.096) 10-3 



= (0.1686 + y 1.335 ) 10-3 hyp/mile. 



Lumpiness correction of line, or of any section, in steady state, at 60.6 '~-', 



9 



— /sinh — = 1. 0002 Vo°. 0002. 



The lumpiness correction factor of this Hne in the steady state 

 is 1.0002 V o°.ooo2 at 60'— ', which, for practical purposes, is quite 

 insignificant. This means that, for a.-c. transmission in the steady 

 state, at 60'~', this lumpy artificial line is equivalant to the smooth 

 uniform line having the linear constants r, g, I and c of Table 11. 

 At 189.4 '— ', however, the lumpiness correction factor, in the steady 

 state, is 1.002 ^ o°.oi, and at yet higher frequencies, it becomes 

 very appreciable. A picture of part of this line appears in Fig. 8. 



In most of the measurements of transients made on this line, 

 the full length of 26 sections, 1255 km., or 780 miles, was employed. 

 At 60.6'—' — the frequency ordinarily used — this length is nearly a 

 quarter wavelength,^ so that, in the steady state, with the distant 

 end B free, the voltage at B with the oscillograph connected there, 

 rises to 5.627 V 110°. 6 times the voltage impressed at A. 



Electrical Connections. — The electrical connections most fre- 

 quently employed in the tests are indicated in Fig. 3. AB is the 



S 



<r1 



"^ — r^'^^ 



OaU 



The Artificial Line 



"TraJOTVOTOTTT-r 



Fig. 3. Electrical Connections of Artificial Line. 



artificial -n- line. At the generator end A, is a single-pole motor- 

 controlled line switch S, for closing the circuit at any desired phase 

 of e.m.f. from the alternator G. A current-recording oscillograph 



6 Bibliography 13, p. 82. 



