DRIVER SUB 



SPEARHEAD 

 CORE BARREL DRIVER 

 LATCHING DOG 



CONNECTING SLEEVE 

 SPLINED DRIVE 



SPRING 



VENT VALVE 



CORE BARREL 



DRILL COLLAR 



CORE BARREL ASSY. - 



CORE BARREL WITH 

 CENTER BIT 



DRILLING BIT 



ft 



CORE CATCHER 

 CORE CUTTER HEAD 

 CENTER BIT 



Figure 334. Wire line eore barrel (Courtesy Reed Roller Bit Company) 





