DAIRYING 



39 



A 



Plate 23. A wall section of a stable constructed of wood. The 

 exterior, A, shows the opening at C. The cross section, B, shows the 

 method of constructing the fresh air intake. The outside opening is 

 shown at D and the inside at E. A simple but effective valve to regu- 

 late the supply of fresh air is also shown at E. 



side opening in the wall at least 3 feet below the one on the inside 

 of the wall. A large number of openings, one about every fourth 

 studding, distributed along the walls are better than a few large 

 ones, and they should all be provided with a door or register 

 which may be easily opened and closed and thus provide a means 

 of regulating the amount of outside air coming into the building. 



