I lO 



Barn Construction. 



near the floor on which the animals stand. This air 

 either in winter or summer for a small stable may be 

 supplied from the inside of the barn at the floor of the 

 room above. The reason is that the temperature 

 there is cooler in summer than if taken from the out- 

 side, the coolest air in the barn above being on the 



floor. It is equally advantageous in the winter, be- 

 cause no matter which way the wind is or how hard it 

 blows, the air from the room above is steady and uni- 

 form both in movement and temperature, that is when 

 the barn doors upstairs are closed. We, therefore, 

 prefer to get our fresh supply from indoors (above) 

 rather than from the outside. To accomplish this, 

 we may use wooden air ducts as shown above, opening 

 from the floor above, and discharging in front of the 

 cattle into their mangers, or near their heads so that 



