KILN DRYING HANDBOOK. 
51 
since the air leaving the sprays and passing through the baffles is at 
its dew point, a recording thermometer is usally placed in the baffles. 
This thermometer shows the dew point rather than the wet-bulb 
temperature, and for convenient use in water-spray kilns, the drying 
schedules should be modified to show the dew-point temperature as 
well as the wet-bulb temperature. 
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Fig. 9. — Cross section of blower compartment kiln. 
BLOWER KILNS. 
^ Fans or blowers are used in several types of kilns for forcing the 
circulation. Blower kilns for drying lumber are, almost without ex- 
ception, of the recirculating compartment type, and those in commer- 
cial use are mostly of the external-blower type. Figure 9 is a dia- 
grammatical cross section of a blower kiln and illustrates the path of 
