224 



M. N, Berdichevskii 



rangement is a particular case of an azimuthal arrangement. L. N. Al'pin has 

 shown that the KS value of an azimuthal dipole arrangement* in a horizon- 

 tally homogeneous medium does not depend on the angle and for the 

 same distances R between the centres of the feed and measuring dipoles 

 coincides with the KS value of the quadrilateral dipole arrangement and 

 consequently with the KS value of the limiting AMN arrangement the 



Fig. 2. 



length of which is equal to the distance R. This property of an azimuthal 

 dipole arrangement also creates possibilities for carrying out curved probes, 

 since in the transfer from one spacing of azimuthal probing to another it 

 is not necessary to keep the angle unchanged. 



THE COEFFICIENT OF THE AZIMUTHAL ARRANGEMENT 



The coefficient of the azimuthal arrangement will be calculated from an 

 approximate formula, the derivation of which is based on the assumption 

 that the length of the measuring line is sufficiently small, and to a sufficient 

 approximation the value of the difference in potential between the poles 

 of the measuring line can be taken as equal to 



ATTAB _ tpAB n/TAT 



(1) 



where: Ej^j^ is the component of the field of the feed line AB along the 

 direction MN. 



It is obvious that (Fig. 2) 



E^Pn = Eij^ + E^N = E^ cos ( J^, MTV) + E^ cos (^ MN). 

 The values E and E^ for a homogeneous medium with a specific resist - 



'^ We will call a dipole arrangement that in which the feed and measuring lines have an 

 infinitely small value. 



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