212 PIERCE. 



IV. Conclusions. 



The following results, believed to be novel, for artificial line con- 

 struction have been here derived. 



1. To obtain a minimum dependence of time lag per section on 

 frequency of an electric artificial line of low resistance, the line should 

 be constructed with mutual inductance between neighboring series 

 inductive elements equal to one-tenth of the self inductance of each 

 series inductive element. 



2. To most closely simulate a real smooth electric line as to attenu- 

 ation constant and surge impedance by the use of an artificial electric 

 line with lumpy sections, there should be in the artificial line a 

 mutual inductance between adjacent loops equal to one-half of the 

 series self inductance per loop. 



3. Details for calculating the performance of lines constructed 

 according to 1 . and 2 . are given. 



Cruft Laboratory, 



Harvard University, Cambridge, Mass. 



