282 



V. I. FOMINA 



ratio — , which we adopt for the case given in Fig. 1, e provided that 



(Qi. k)L 

 the foUomng assumptions are made 



{Q2, k)L 



Q2 



{Ql,k)L {Ql,k)L' 



since for small spacings of the probes it is possible to treat the medium ^2 

 as being of infinite thickness. 





AB 

 2d 



Fig. 8. a — VEP curves for a horizontally homogeneous medium; h — HVC comparison 



curves; c — approximately constructed curves for — =1/99; d — approximately 



Pi 



' constructed curves for = — ^^^ 



Q\ (^1, ft)L 



The equation 



(?2, k) 



g2 



1 

 99 



is adduced for the spacings which correspond to the asymptotic part of the 

 curve. 



Both variants of an approximately constructed curve for the case d 



(1 /7 1 \ 



ratios — =2 and — = — j and spacings oi AB parallel 



to the contact are given in Fig. 8. 



