SANITATION 73 



Table giving Dimensions of Liquid Manure Tanks. 



i 



2 Tank Capacity. Tank Dimensions. 



CO 



Cub. ft. Gallons. Rectangular. Circular. 



The tank must be made of impervious maternal throughout, 

 and the bottom should be constructed of reinforced concrete. The 

 sides may be built of concrete reinforced like the bottom, or be brick- 

 built and faced inside with a good coating of cement. Absolute 

 gas-tightness is an essential of all liquid manure tanks so as to 

 conserve the ammonia. The top must be fitted with a manhole, 

 the cover of which should be of iron with a tongue to fit into a groove 

 in the frame, which should be filled with grease so as to form a 

 gas-tight joint. The pump for extracting the liquid should be as 

 simple as possible, coupled with efficiency, and should be so fitted 

 that no escape of gas is possible. 



THE DISPOSAL OF SEWAGE. There .are two methods of dispos- 

 ing of human excreta, the Dry and the Wet. 



Dry Method. With this method the excreta is deposited into 

 some form of privy or midden or into a pail. For several reasons 

 the dry or conservancy method is unsuitable for towns, but in the 

 country and for isolated houses it is a useful and safe procedure. 

 Privies should be placed well away from a dwelling-house, cow byre 

 or dairy, and not be so located that pollution of water supplies 

 might be possible. They should 'be constructed of impervious 

 material, such as bricks lined with cement, and should not be too 

 large. At their best they are undesirable. 



Pails are not objectionable if kept under proper conditions. 

 Each excretal deposit should be covered with earth or ashes and 

 the pail should be emptied daily, the contents being buried under 

 the soil. 



The Wet Method. With the wet method the sewage and foul 

 water is carried by water through pipes or sewers to an outfall 



