32 



BULLETIN 1141, TJ. S. DEPARTMENT OE AGRICULTURE. 



the group of tunnels which they heat, but have 2 feet additional 

 length, in order to permit the furnace to stand immediately beneath 

 the lower end of the tunnel. The hopper type of inclosure about the 



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Fig. 13. — Second-floor plan of the tunnel drier. 



furnace is not employed in tunnel evaporators; the furnace room is 

 merely a rectangular inclosure having air inlets in the walls, as 

 previously indicated. In the plans, Figures 12 and 13, three furnace 



