592 



Subsurface Geologic Methods 



-NON-MAGNETIC 

 DRILL COLLAR 



-SINGLE SHOT 

 BARREL 



-SINGLE SHOT 

 INSTRUMENT 



^A= 



,OUTER CORE 

 BARREL 



JNNER CORE 

 BARREL 



.-CORE SHOE 



. NON-MAGNETIC 

 DRIFT INDICATOR 

 BARREL 



-MODIFIED DRIFT 

 INDICATOR 

 INSTRUMENT 



^SPECIAL SUB 



-CONVENTIONAL 

 CORE BARREL 



\\ 



-RETRACTABLE 



CORE 



BARREL 



-DRIFT 

 INDICATOR 

 INSTRUMENT 



-CORE 

 RECEIVING 

 TUBE 



I \\ ^SCRIBER 



^MHVCORE 



CATCHER 

 x^ ly^CORE 

 V/f SHOE 



Figure 306. Core-orientation equipment. 



