Second progress report on the strength of structural timber . n in the cross section of North Carolinapine beams was determined by cutting sections 1 inch in thicknessfrom near the center of the sticks and dividing the sections into nineparts in the directions shown in Diagrams I and II. The figures inthe various parts of the sections show the percentage of moisture. 10396—No. 115—07 2 10 14 inches cent. per cent. cent. cent. percent. cent. cent. percent. 29 per cent. Average percent. Diagram I.—Distribution of moisture in cross secti
Second progress report on the strength of structural timber . n in the cross section of North Carolinapine beams was determined by cutting sections 1 inch in thicknessfrom near the center of the sticks and dividing the sections into nineparts in the directions shown in Diagrams I and II. The figures inthe various parts of the sections show the percentage of moisture. 10396—No. 115—07 2 10 14 inches cent. per cent. cent. cent. percent. cent. cent. percent. 29 per cent. Average percent. Diagram I.—Distribution of moisture in cross section midway of the length of North Carolina loblollypine beams. Average of 10 sections taken from sticks 8 by 14 inches by 10 feet. The timber was airdried from 2 to 5 months. The distribution of moisture throughout the cross section wasalso determined on a set of disks cut from beams under three con-ditions of seasoning—green, air-dry, and kiln-dry. Diagram IIshows the distribution in the three cases, sapwood being denoted bycrosshatchings. M (b) (c). Tftmrrrr-m 71 ZS 17 20 Z? \z? ZZ 1 w//// t /JJM ULLLLLLLl \ z? 3 Z7, (i 33 29 3 ze 9 Arerctje 43%Greer? Tearecl 3 daysKQiter /eavirpq saw. /)veraje Z6 °/o/J i r dry ir? Me operp. Average ZO °/oK/lf? dry )r? Hte. Kiln6 days. Diagram II.—Distribution of moisture in cross section midway of the length of North Carolina pine beams. (a) Average of 10 ) Average of 4 sections,(c) Average of 4 8 by 1G inches in sect ion. In green timber that has been submerged in water for some timethe moisture per cent near the surface is nearly twice that in thecentral part. In the air-dried sticks the drying did not penetrateto the central part at all. Section c was dried more quickly thanthe others, and the variation in the different parts is consequentlygreater. The sections used in both b and c were cut from sticks [Cir. 115] 11 which were badly checked by too rapid seasoning. Along the beamvariation in moisture
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