626 



SuBsuRFjiCE Geologic Methods 



It was thought desirable in some geologic territories to record three 

 resistivity curves instead of three SP curves. Accordingly, the design and 

 development of a resistivity dipmeter was undertaken in our research 

 department, particularly by H. G. Doll and W. B. Steward. The avail- 

 ability of a resistivity dipmeter, in addition to the SP dipmeter, has ex- 

 tended appreciably the application of the art. Some six or seven thou- 



Typical Dipmeter Level 



Upper Spring Guide 



Photoclinomeler 



Dipmeter Electrodes 



Lower Spring Guide ^920 



Figure 326. Dipmeter hole assemblage. 



Figure 327. Record of typical 

 dipmeter level. 



