VENTILATION. 



205 



raised 2 in. or 3 in., a block of wood of the same width as 

 the window is placed in the vacant space, and the lower half of 

 the window is allowed to rest on it so as to give vertical ven- 

 tilation between the upper and lower halves (Fig. 17). 



B. By windows, which should be a little above the heads of 



Fig. 15- 



Fig. 16. 



the horses, so as to obviate the danger of a draught, and also 

 to prevent the animals reaching them. When the windows are 

 separated from the horses by a passage, they may be placed 



block of ro 



Fig. 17. 



Fig. 18. 



lower down. It is well to have these windows constructed so 

 that they may give an upward direction to incoming currents 

 of air, and that while freely admitting air, they will keep out 

 rain and snow. These duties are fully carried out by Shering- 

 ham's air inlet, the lower part of which revolves on hinges, 



