THE METHOD OF CURVED ELECTRICAL PROBES 



233 



Eq = E'^ + E^ = E^ sin (x + E^ sin (i 



AB 



sin0 



AB 



sin O 



E^ 



EB. 



Here: E^, E^ are the field intensitites of the field line AB at the observation 

 point ; 



R is the distance from the points of observation to the centre of the feed 

 line AB; 



i?2 and i?2 are the distances from the point of observation to the poles 

 of the feed line AB; 



is the angle formed by the feed line AB and the section connecting the 

 middle of the feed line with the observation point. 



By analogy with the calculations for the previous section we find that 



^A IT 1-2 





Hence 



E 



MN 



IS) 



Ee 



+ 1 + ^- cos 

 K 



COS A — sin A x 



?-3 



l+2^cos6) 



AB 



t-3 

 2 



. ^{[IABY ^ AB „ 



ABV -, AB „ 

 — +l-^cos0 



/-3 



ABV ^ AB „ 

 2^ +1^-^-0 



l-2^cos0 



AB 

 2R 



sin0 



ABV , AB 



2R +1 + -^-^^ 



f-3 



2 



2^ +l-^cos(9 



<-3 • 

 2 1 



( 



(18) 



The results of the calculations using formulae (17) and (18), are given 

 in Table 2. 



As can be seen from this table, the limiting relative error /n for determin- 

 ing the value q^, caused by angular errors A of the order of 1-1.5°, varies 



