CORE ORIENTATION 



93 







A.P.I. Drill- Pipe Thread 

 Upper Sub (Sfeel) 



Fig. 46. — Macready's multiple- 

 photograph orientation instru- 

 ment. 



Thrust Bearing 



Ouier Case(Non-Magnefic Alloy) 



Insfrumeni Case 

 Oraduafed Reference Plug 

 Compensafor 



Check Valve 



Coupling CAIloy Sieel) 



Ouier Barrel (Sfeel Drill Pipe) 

 Inner Barrel (Sfeel) 



Lower Sub (A Hoy Sfeel) 

 Cuffer Head 

 Inner Nose 



Fig. 46a. — Assembly of Macready 

 orientation core drill. 



