80 



VETEEINAEY HYGIENE 



There are so many different types of stable that it is only 

 possible to indicate general principles. 



The following table should be useful in determining the 

 size of inlets depending on the velocity of the wind. The 

 scale of wind is known as Beaufort scale. 



Having judged the velocity of the wind, knowing the 

 number of animals in the stable, and the number and size 

 of the ventilators, it is easy to calculate the width there 

 should be open to supply 15,000 cubic feet of air per 

 head. 



The rule is, multiply the number of animals to be sup- 

 plied with air, by the size of the inlet corresponding to the 

 judged velocity of the wind. Divide this by the number of 

 ventilators on the inlet side of the building, and the result 

 is the size in square feet which each inlet should be open. 



Example.— ^o\N wide open should be the windows or 

 ventilators of a stable under the following conditions ? 



{a) The velocity of the wind is 13 miles per hour. 



{b) The number of horses in the stable, 12. 



(c) The number of windows on the inlet side, 6. 



{d) The width of each window, 2 feet 6 inches. 



In the table opposite to 13 miles is "2 ; therefore, 



•2 



12 = number of horses. 

 Number of windows = 6 | 2-4 



•4 = number of square feet for 

 each window x 144 = 57-6 

 inches. 



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