The kiln drying of lumber; a practical and theoretical treatise . been dried infull-sized kilns to shipping weight in 24 hours by thismethod. The sapwood of southern pines is darkened,otherwise the lumber comes out in perfect recent improvement in this method,^ for use with flatpiling, is shown in Fig. 14, in which the steam jets are soplaced that the circulation is readily reversed in direc-tion. It has been demonstrated to be successful on acommercial scale. It should prove particularly usefulfor some of the West Coast lumber, as Douglas fir, * With deep sorrow, his death by ligh
The kiln drying of lumber; a practical and theoretical treatise . been dried infull-sized kilns to shipping weight in 24 hours by thismethod. The sapwood of southern pines is darkened,otherwise the lumber comes out in perfect recent improvement in this method,^ for use with flatpiling, is shown in Fig. 14, in which the steam jets are soplaced that the circulation is readily reversed in direc-tion. It has been demonstrated to be successful on acommercial scale. It should prove particularly usefulfor some of the West Coast lumber, as Douglas fir, * With deep sorrow, his death by lightning, since the above waswritten, is announced. Mr. Betts was a young man of marked abilityand an unusually pleasing personality. ^ Patent applied for, Serial No. 149,972, Feb. 20, 1917. COMMON PRACTICES IN DRYING 49 white fir, red fir, Sitka spruce, Alaska cedar, and otherfirs and spruces, and incense cedar. In experiments made at the Forest Products Lab-oratory in Madison, Wis., incense cedar was dried froma weight of 6079 pounds per ^ feet to 1982 pounds in. ^:i^\^ /:.-v.^~~ -^ —*-~—\<t-yA Fia. 14.—Flat piling. 48 hours, or an average rate of 83 pounds per ^ boardfeet per hour, by far the most rapid drying of whichthere is any authentic record for a pile of lumber of asemi-commercial size. The following species of woodhave been successfully dried by this method. The timeof drying, reduction in weight, and percentage of de-grade are also given in Table IV. 50 THE KILN DRYING OF LUMBER Mo w g n o12; I 0! s a 1e if II ee 1 S §S CO O 1 1 s 1 8 • 3 sa • PH a ill 1 X. ?ad a G3 0, rfS _o QD s £ ?3 e»>. 9§.9 aaa M 5 a 3 3 3-dT3-S-3:S § S 3 Si aa 60 t4 a 0) o OQQqQtftf^^>. i^ t^ t^ ^» 10 to t- « 00 00J^t»lO IM IMiN(MINC<lC<I(N(M (M.!N (M (M <N <N <Neq<N(N (N
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Keywords: ., bookcentury1900, bookdecade1910, bookidkilndry, booksubjectlumber
