VENTILATION 



65 



unequal temperature, depending as they do on the air 

 being heated by the bodies of animals occupying the 

 building, are not only irregular but undesirable. On 

 the other hand, as a means of artificial ventilation it 

 may be made a most perfect system if expense be no 

 object, and we may here conveniently consider this 

 question. 



Artificial Ventilation. — If the air entering a building can 

 be warmed and the place maintained at a temperature 

 of 60° Fahr., the greatest op- ^^ 



ponent of fresh air can no longer 

 have a valid reason left for 



closing an aperture. 



The maintenance of stables 



at a temperature of 60° Fahr. 



through the heat given off from 



the bodies of animals, as is at 



present the case, is hygienically 



bad. If it be considered neces- 

 sary to bring up horses and 



cattle as tender hothouse plants, 



then to live at 60° in an air 



saturated with moisture is the 



best means of securing it. If it 



be recognised that this heated 



foul and moist atmosphere is 



unhealthy, and yet a tempera- 

 ture of 60° is desired, it can 



only be obtained by artificial 



ventilation, the simplest system 



probably being that shown in 



A bracket containing a metal tube, bent m several direc- 

 tions so as to give it a large surface, is placed opposite an 

 inlet. Inside the tube is a Bunsen burner, the products 

 of combustion being carried outside the stable. 



The heat travels through the whole length of the pipe, 



Fig. 2.— Boyle's system for sup- 

 plying fresh and warmed air 

 to stables. 



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