SEISMIC METHODS 



^77 



YELLOW STRIPE "N" ROD 



M:^:^^^^^////^ <^<^^^ 



FISH TAIL BITS— HARD METAL FACED 



Forged Fish Tail Bits- 

 Hard Metal Faced 



2 Wing 6 Wing Pilot 3 Wing 



Cast Steel Fish Tail Bits— Hard Metal Faced 



GRIEF STEMS OR KELLYS 



^rP-fi-Hfrn-iir — ^ 



i" 'I I' I ' ' I '. 1 L 



N 



SAFETY CLAMP 



WATER SWIVEL HOISTING PLUG 



lH 

 ^ 



M 



Fig. 549. 



