BULLETIN 8&4, U. S. DEPARTMENT OF AGRICULTURE. 
the spray chamber is passed through baffle plates, which remove 
any mist or drops of water but leave the air saturated with moisture. 
The purpose of the sprays is to induce circulation throughout the 
kiln by forcing the air down the chambers, to condense the moisture 
evaporated from the lumber, and to regulate the humidity by con- 
trolling the temperature of the air leaving the spray chamber. 
Fig. 3.— Battery of three kilns. 
A steam spray or jet line at the top of each spray chamber and 
extending the full length of the drying compartment admits satu- 
rated steam into the kiln when required for "steaming" the lumber. 
Condenser coils may be provided on either side of the kiln above 
the spray chambers, or in the center of the kiln if the kiln is arranged 
