﻿32 



BULLETIN 1U1, U. S. DEPARTMENT OF AGRICULTURE. 



the group of tunnels which they heat, hut 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 



