Figure 14-17. Current distribution of laterolog device. 



horizontal slice of space whose thickness is about equal to the distance separat- 

 ing the midpoint of M^M^ from the midpoint of M 2 M%, or 32 inches. 



The Laterolog 3 consists of a center-point electrode that emits a constant 

 calibrated current and long elecrodes above and below that are used to achieve 

 focusing somewhat as in the Laterolog 7. A smaller beam width can be obtained, 

 so that this device is useful for studying very thin beds. 



307 



