INSTRUMENTAL SURVEY OF BOREHOLES 



51. 



2. To obtain the thickness, depth and constitution of 

 such deposits. 



3. For shaft sites. 



4. For conducting electric cables (Fig. 22), steam and 

 compressed air pipes, also haulage ropes to the mine. 



- ,, , nConnechon Wooden Reel 



Several furns of \\ ^^ p^j^ Line^iT-kpn which Cable 

 Wire around Reel, \^ ///■ ':'\ was shipped 



limbers 

 supporfing 

 Reel-\ 



Casing of 

 Borehole ' 



(.a) 



Wooden Clamp holding 

 fwo sf rands of Cable 



(b) 



777777777777777 .:;S 



(c)- Suspension Glamp 



Fig. 22. 



5. For hydraulic stowing. 



6. For utilizing any hydraulic head which peculiar geo- 

 logical conditions may provide in old workings (Fig. 23). 



rSurface 

 rrr7TTfrr->i 



+ 850' 



El A 800' 

 FiQ. 23. — Ideal cross section of a synclinal basin. 



7. To aid ventilation by draining off gases. 



8. For circulating tubes when sinking by the freezing 

 process. 



9. For cementation. 



10. For checking any other boreholes. 



