Z = distance of center "0" / 

 of solenoid system 

 below ground loop 

 r = radius of ground loop 

 A = angle through which 

 the two solenoids 

 are seen from 

 ground loop 



AMPLIFIER 



Ground loop of unit 

 cross sectional area 



OSCILLATOR 



Amplifier and 

 oscillator housing 



Figure 14-14. Schematic induction log device. 



300 



