no 



OPERATIONS OF DRAINING. 



reaching the channels and reservoirs below the surface, 

 when an ordinary drain could not reach them. 



" The auger employed for this purpose is similar to a 

 carpenter's wimble. It may be from four to five inches in 

 diameter. Square iron rods are made to be screwed into 

 each other, so that the length of the line of rods may be 

 increased in proportion as the auger penetrates the ground. 

 In fig. 12, A is the auger, B one of the rods, C a key 

 for turning it round and working it, D another key for 

 holding the rods when they are to be unscrewed by means 

 of the key C. 



Fig. 13. 



Fig. 12. 



Ei 



3D 



*' This instrument may frequently be found useful when 

 the channels and reservoirs can be reached in this man- 

 ner. The apertures are formed by the auger in the bot- 

 tom of the drain. When the water is reached, it will 

 spring up into the drain, in the same manner as water in 

 the bottom of a well. It is not necessary to employ any 

 artificial means for- keeping the apertures open, as the 

 flow of the water will suffice to maintain for itself a pas- 

 sage. 



" Sometimes, in place of an auger-hole, wells are sunk 



