BUTTXER AND MEYER DRYER. 



183 



retain moisture, as all the heat that the gases communicate 

 to them serves in the transformation of this water into steam. 



Upon general principles, the Buttner & Meyer dryer consists 

 of a large brick frame-work, upon the upper part of which is a 

 furnace, surrounded by a dome ; in it the hydro-carbonated 

 gases complete their combinations and are finally consumed, 



FIG. 20. 



End View of Butt tier & Meyer Dryer. 



that is to say they are transformed into carbonic acid in conse- 

 quence of their combination with air with which they come into 

 contact. This frees these gases from the particles of soot that 

 would contaminate the cossettes being dried, and which would 

 consequently give them an unpleasant flavor. The bottom of 

 the dome in question is divided in two by a small brick parti- 



