STABLE CONSTRUCTION AND FITTINGS. 



53 



should have removable covers and be freely accessible. All drains 

 should be free of sharp angles, any change of direction being made by 

 curved pipes or " bends." 



Where the stable drainage runs into the outside drain or sewer, a " trap " Traps, 

 is placed to 'prevent the return of sewer gases. The principle on which 



Simple Syphon 



Fig. 15. 



Stcybie Trt^p 



Gulley 



Fig. 16. 

 Water level. 

 Receptacle to catch sediment. 



Fig. 17. 



3. Flap reaching below water level. 



4. Gratings to catch solids. 



traps are constructed is to place a body of water between the stable air 

 and the sewer air and so prevent the return of the latter. There are 

 many varieties of traps, but the principle is the same in all, and the 

 diagrams appended will help to explain it. 



Whatever pattern of trap is adopted, it is imperative that the water seal. Water 

 i.e.^ the body of water interposed between the stable and sewer, is of seal. 



