82 FARM APPLIANCES. 



* 



by eleven inches. Fold one-fourth of an inch at each end 

 of a strip of sand-paper, and slip under the head -piece 

 by loosening the screw. Tightening it will hold the paper 

 fast and smooth for work. A common wood screw may 

 be used in place of the knob, but is not as convenient, as 

 it must be turned by a screw-driver. 



CHAPTER IV. 



APPLIANCES FOR THE BARN, PASTURE AND DAIRY. 

 STABLE VENTILATOE. 



It must not be supposed that fresh air in the winter 

 is to be excluded from stables for the purpose of keeping 

 the animals warm. Warmth alone is not comfort. An 

 animal may suffer from cold in a close, damp, impure 

 air, which is really warm, while it will be quite comf ort- 



103. STABLE VENTILATOR. 



able in fresh, pure air, which is much below freezing 

 temperature. The absence of oxygen in the one case re- 

 duces the vital warmth, while its abundance in the other 

 case maintains an agreeable and comfortable feeling. 

 Consequently, ventilation of stables is necessary, even in 

 the coldest weather, to keep the animals in good health 

 and in comfort. But it should be regulated judiciously 



