WATER AND ICE SUPPLY 



171 



the dairy house, should stand on slightly elevated ground 

 so as to insure drainage away from.it. 



Construction of Well. In a properly constructed 

 well, no water should enter it except near the bottom. 

 This compels the water to pass through a thickness of 

 earth sufficient to purify it where the wells are of a 

 reasonable depth. 



Where there is no rock or hard clay and where the 



Ordinary mil. 



Fig. 62.— Soil Strata. (From Harrington's "Practical Hygiene.") 



water can be had at a reasonable depth, the driven well, 

 commonly knov/n as the Abyssinian tube well, is the 

 cheapest and one of the safest. This well is made by 

 driving into the ground a water-tight iron tube, the lower 

 end of which is pointed and perforated. 



In case rocks and hard clay must be penetrated, or great 

 depth must be reached to secure water, the bored or 

 drilled well, piped from top to bottom with water-tight 

 iron pipes, will be found most satisfactory. 



