86 



CLEAN MILK 



Sketch B shows a method of ventilating a lean-to stable. The 

 air enters as represented by the arrows at A B and passes out 

 through a flue built on the inside of the upright or main barn. 

 This flue may rise directly through the roof or it may end at E. 

 as shown in the figure, the air passing through a cupola. If the 

 upright barn has a balloon frame, then the space between the 

 studding could be used as ventilating flues. These flues could be 

 made tighter by covering inside and out on the studding with the 

 lightest galvanized iron. 



Sketch B — Method of ventilating a lean-to stable. 



Sketch C shows a section of the cow stable of the dairy barn at 

 the Wisconsin Experiment Station. A single ventilating flue D E 

 rises above the roof of the main barn, and is divided below the 

 roof into two arms A B D, which terminate at or near the level 

 of the stable floor at A A. These openings are provided with ordi- 

 nary registers, with valves to be opened and closed when desired- 

 Two other ventilators are placed at B B, to be used when the stable 

 is too warm, but are provided with valves to be closed at other times. 

 C is a direct 12-inch ventilator leading into the main shaft, and 

 opening from the ceiling, so as to admit a current of warm air at 



