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56 BULLETIN 1136, U. S. DEPARTMENT OF AGRICULTURE 
TaBLeE 10.—Special kiln-drying Schedule 105 for wide, flat-grain Douglas fir 
finish lumber 
Time in the kiln after | Dry-bulb/Wet-bulb Pelative 
which changes should | tempera- | tempera- Haeedie Additional instructions 
be made, hours ture ture y 
OR: oie Per cent 
QE eae ee 8 et Sa | a SES Bag re ta | eee Start steaming. 
SURES ee I [Sees Sy ere EO ea ee Reach 150° F. and 100 per cent humidity. 
Oe a Soe eS ee SE Ee ENR A ROS ees ee ae Stop steaming. . 
ID ASEI TES EE Sipis nes pega tea 1G = 150 147 92 
73 || See had ge Pi car St 155 147 81 
ADI LETS Eke AT) 7s uaa Dah, 160 147 71 
C50) ee Re as he 160 140 58 
SS Se 2 ee 165 140 51 
OG eta as het ode aie 170 140 45 
1 OS ce kes ee 170 130 33 
TRY ee eee eed eer Os eet 170 130 33 | Reverse direction of circulation. 
QE Ee oe par ce as 8 Ec | CAN hes Sra bs Lr eee | ee eee Steam at 170° F. and 100 per cent humidity. 
ID ioe esa ee led ce |e een eek tel | a ec End of run. 
Table 10 is a very slow schedule, with extremely high humidity at 
the beginning. An unusually rapid and uniform circulation is re- 
quired to make the use of such a schedule satisfactory. 
SOUTHERN YELLOW PINE 
In the various species of southern yellow pine, as well as in 
Douglas fir, the application of special schedules to special items has 
proved economically sound. Even in particularly troublesome cases 
the savings from lessened degrade are much greater than the added 
cost of the more careful kiln drying. The following special schedules, 
for operation on a flat-time basis, are intended for use with fast- 
circulation compartment kilns; they apply specifically to longleaf, 
shortleaf, and loblolly pine, although in general they are satisfactory 
for all commercial species of the southern yellow pines. 
TABLE 11.—Special kiln-drying Schedule 106 for southern yellow pine* 
Dry-bulb Wet-bulb Relative 
Time in the kiln after which changes should be made, hours tempera- | tempera- wa 
pes rac humidity 
OPT a fe Per cent 
ae ar gd IEE Ss PD Eh a A ee Dat ee LE Oe RN a 175 170 89 
Beste Ben Ee 2 ER REA Ne ARE ANE Ta FTA Ee ae Ob ee 190 170 63 
files eh SCs sees eh EL ee, ee Sie nL ewe ere enee Some ePUOe ears ee Meroe es oe, vt 200 160 39 
(GY ge ee TER ea er tone eee VAG NCSU eentone (uty Lt eS he NE ea 2 190 182 84 
{PN LS iy ond EE EE VE Eee Gat SA Sie kPa AE ee Sk ies | a RT Me eves Bie #2 End of run 
1 For use with 1 by 3 and 1 by 4 inch No. 2 Common and Better flooring and partition stock. 
TABLE 12—Special kiln-drying Schedule 107 for southern yellow pine* 
Dry-bulb | Wet-bulb) pojative 
Time in the kiln after which changes should be made, hours tempera- | tempera- was 
: ture ture | Dumidity 
aH I rated OK Per cent 
(PRS d are Oe NY OCT aie MELON EY VSM Ae mest PADI SUP ne fee A NET eS Nl 180 175 89 
REMC E ope sev od Sal RT ae dap fl yk ieee Ge Re Aan Ae A od En ee 190 170 63 
eb se Nd pei PR Se Os 5 SP een ete cen SOO a Pate OCs 200 170 51 
i! Dee Mee Mean OR Pea CPR MEW ate PareNnT tey Rt UAE cio SAR at hs ee a SE yp SL 210 170 41 
<2) PEAS AEA ee eee en RIDER ds MP TEU RY ba Ser re raed oe ell 190 182 84 
OG sin ere Se I Es Be a Eee) een gi End of run 
1 For use with 1 by 6 inch and wider No. 1 Common and Better lumber, 
