. Department bulletin. Agriculture; Agriculture. 26 BULLETIX 1136, U. S. DEPARTMENT OF AGRICULTURE. tree. Thus the knot shrinks away from the wood lengthwise of the board, but docs not shrink appreciably in the radial direction. End checking, which is caused by the very rapid drying from the end surfaces, is discussed more fully under " Drying ; COLLAPSE. One form of seasoning defect which occurs in the green wood is the actual collapse of rows of cells, just as a rubber tire collapses when the air is let out. This defect occurs only in a few species, such as redwood, weste
. Department bulletin. Agriculture; Agriculture. 26 BULLETIX 1136, U. S. DEPARTMENT OF AGRICULTURE. tree. Thus the knot shrinks away from the wood lengthwise of the board, but docs not shrink appreciably in the radial direction. End checking, which is caused by the very rapid drying from the end surfaces, is discussed more fully under " Drying ; COLLAPSE. One form of seasoning defect which occurs in the green wood is the actual collapse of rows of cells, just as a rubber tire collapses when the air is let out. This defect occurs only in a few species, such as redwood, western red cedar, swamp oak, and red gum. The remedy consists in the use of low temperatures at the beginning of the kiln Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. Washington, D. C. The Dept. : Supt. of Docs. , G. P. O.
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