Bui. 1179, U. S. Dept. of Agriculture. 
PLATE V. 
Fig. I. — General View of One of the Earlier Oil-burning Fur- 
nace Plants for the Volatilization of Phosphoric Acid, Arling- 
ton Experimental Farm. Va., Showing Furnace Dust Catcher, 
Preheater, Stoves, and Electrical Precipitator. 
Fig. 2. 
-A Closer View of the Furnace Proper Showing Slag 
Holes in Crucible. 
