APPENDIX II 



FURTHER NOTES ON ABYSSINIAN 

 TUBE PIPES 



THIS kind of well forms a cheap and handy source 

 of water supply. Some notes were made of it on 

 page 40. This plant is cheap, and can be made by a 

 local blacksmith, and the driving and fitting com- 

 paratively easy. A tube can be driven into drift 

 deposits which are found over the whole of the older 

 foundations. They vary in thickness, and consist of 

 alternate layers of gravel and other material of a 

 more or less porous nature, and clay which is con- 

 sidered as impervious. Water will usually be found 

 in the porous material when the clay is pierced. 

 Tubes can be driven through the clay for about 

 25 ft. if there is not any hard rock. In the case of 

 rock or greater depths boring has to be resorted to. 

 For driving a point, illustrated in fig. 31, lap-welded 

 steam pipe and a pump are required ; for small 

 houses i-J- in. tube will do. Stock lengths of 3 to 

 10 ft. can be obtained. (Gas pipe is quite unsuit- 

 able.) The sockets must be bevelled off to prevent 

 undue resistance in driving. 



The lower tube is bulbed up to a point, as shown 

 in fig. 31. The holes should be in fine strata and 

 J in coarse. They should extend for about 18 in. 

 and have a total area greater than that of the tube. 



(161) ii 



