H. Orr 
269 
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Three 4" outlet pipes extend through each of the side walls close to the 
ceiling,—one at each end and one midway between these,—each connected 
with an elbow outside. 
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The front of the chamber consists of two pair of tight-fitting doors. The 
inner pair made of tongued and grooved lumber, and lined with corrugated 
iron. The outer pair made of tongued and grooved lumber are separated 
from the inner pair by 3", and overlap them at the sides and top. 1 heir 
purpose is to render the chamber more air-tight. (The outer pair are not 
