204 



MISSOURI AGRICULTURAL REPORT. 



by a force equal to the difference in weight of the columns. There are 

 those who maintain that the last factor is the chief if not the only one 

 which is operative in causing draft in chimneys, and these insist that 

 the air should be admitted to the ventilating flue at the level of the 

 ceiling. The universal daily experience with every properly constructed 

 and placed chimney proves beyond a doubt that the temperature factor 

 is secondary and not primary in producing draft ; for always before 

 the fire is lighted there is a strong draft and it increases in strength 

 with the velocity of the wind across the house. 



Figure 1.— Showing position of ventilators and fresii air int;ilies. 



In Fig. I there is represented the floor plan of a stable where the 

 ventilating shaft is located in the angle outside formed by the wing and 

 the main Irarn. To secure the strongest action of the ventilator a l>cttcr 

 position would be at the center, at the point marked A, and if the 

 cows faced out this would be the best place for the shaft, so far as 

 ventilation is concerned. But, usually, the shaft, in such a position, 

 would be so much in the way that it could not be placed in that posi- 

 tion. It is usually possible to place it near such a position by sacri- 

 ficing the stall of one cow. 



Tn Fig. 2 there are represented three methods of taking llio air 

 into a stable. At A is shown the simplest method which can be adopted 

 in a frame stable which is sheeted on both sides of the studding. In 



