tilation of Farm Buildings. 



365 



FIG. 160. Is a section of the cow stable of the dairy barn at the Wis- 

 consin 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 ordinary 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 di- 

 rect 12-inch ventilator leading into the main shaft, and opening 

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

 to the main shaft to help force the draft. This ventilating shaft is 

 made of galvanized iron, the upper portion being 3 feet in diameter. 

 The covering on the outside is simply for architectural effect. 



