72 STABLE VENTILATION. 



movement upwards, to compensate which, fresli 

 air enters the stable, and so the amount of stag- 

 nant air is diminished. We have examined a 

 number of. stables in which these shafts have 

 been introduced. The state of the air we found to 

 be better in some than in others, and much better, 

 no doubt, in all than it would have been in the 

 absence of the shafts ; but the results generally 

 show that dt is a mistake to construct stables on 

 a plan which renders such shafts necessary. There 

 is, no doubt, an additional movement of the air 

 effected by them, but it is questionable whether 

 any particular size of shaft would ventilate such 

 stables sufficiently." 



The recommendations we have to make are : 



First. That every stable should be constructed 

 to afford about 1500 cubic feet of space for each 

 horse. 



Second. That in stables with lofts and apart- 

 ments above them there should be, at a distance 

 of six inches from the roof, sufficient openings, 

 protected by wire gauze or perforated zinc, to 

 insure free communication between the internal 

 and external air. 



Third. In the absence of special openings, the 

 windows may be made available for ventilating 

 purposes by substituting wire gauze or perforated 

 zinc for glass, and precluding the possibility of the 

 apertures being blocked up. 



Fourth. In stables without appartments or lofts 

 above, the plan suggested by the commission 

 appointed to report on ventilation of cavalry sta- 

 bles, may be adopted, viz. r ventilating by a 

 louvre, 16 inches wide, carried from end to end 

 of the roof, affording about 4 square feet of venti- 

 lating outlet for each horse. 



