BUILDINGS 



297 



shafts about eight inches square, starting near the floor and 

 extending through the roof, and equipped on the top. with a 

 device for preventing the wind from blowing down the shafts. 

 (Fig. 69.) 



Chimney and Pipe. If a feed cooker is used, it could be 

 utilized to great advantage in assisting ventilation. If the 



FIG. 69. The King system of ventilation as shown for a dairy barn or hog-house. The 

 air outlet should start near the floor and extend through the roof. The inlet for air into 

 the room is near the ceiling, but should start outside well above the ground. In cold 

 weather, windows are for light, not for ventilation, when the King system is in use. 



building is not a very long one, the chimney may be constructed 

 at the opposite end of the building from the feed cooker, and 

 the pipe from the feed cooker run the whole length of the 

 building before it enters the chimney. In a long building the 

 chimney may be placed about the centre, so as not to have too 

 great length of stove-pipe. The heat from the stove-pipe has a 

 \\on.lerful influence in aiding the circulation of air in the 

 pen, as well as modifying the temperature and helping to 



