94 



FIG. 39. Form 

 of well borer. 



FIG. 40. Method of using well auger. 



FIG. 41. Special 

 well auger for 

 lifting boulders. 



(0 



-00 



X 

 + 



s 



TJ 



-OH 



-u 

 ~Q- 



-VoAv: 

 FW^< 



FIG. 42. Diagram showing 

 advantages of packing 

 with gravel. 



