AIR AND VENTILATION 



99 



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I 



* 



draught off the animals. Consequently they are nearly always 



shut, being useless for either inlet or outlet. 



OUTLETS. The best possible form of outlet is an open ridge 



the full length of the 



building. By this pro- 

 vision the heated atmos- 

 phere escapes directly 



without being retarded 



by friction, its escape 



being hastened by the 



aspirating influence of 



any wind passing over 



the roof ridge. The 



physical explanation of 



this is clearly indicated 



by the arrows in figure 



39. 



It should be noted 



that the open ridge 



system is only possible 



in buildings without a loft. A permanently open ridge such as 



described has been successfully adopted for cow byres and piggeries, 



and found to be both cheap and efficient. The width of the opening 

 ^ ^ __ will, of course, depend upon 



the height and size of the 

 building. For an average 

 piggery a width of 2 or 3 



- ^ 2^*>. inches will be found to be 



sufficient. For byres and 

 stables the width of open 

 ridge must be calculated in 

 accordance with the pro- 

 visions laid down on page 

 FIG. 39. A Double Cow-shed with a per- 94 for outlets required in 

 manently open ridge for the escape of proport i on to accommoda- 



Fic. 38. Elevation and section of a Hit-and-Miss 

 Window. 



foul air. The air inlets are drain pipes 

 set at right angles to the wall just above 

 the cows' heads. 



tion of stock contained. 



Findlay's System.* Un- 

 doubtedly an improvement on permanently open ridge, especially 

 for a building in an exposed position, is the method known as 

 Findlay's System. It can be used for byres, stables or other animal 

 houses that have an open roof, that is where there is not a room 



* Findlay's System of Byre Ventilation (Registered), John Findlay, 

 Springhill Farm, Baillieston, Glasgow. 



