. Department bulletin. Agriculture; Agriculture. Fig. 4.—Development of a surface check into a honeycomb. 1, 2. nnd 3 show the check gradually closing up as the piece dries and shrinks. 4, 5, and 0 indicate how the tensile stresses deepen the bottom of the honeycomb as the casehardening becomes more severe. The depression along th<- center of the top, in 5 and ft. is typical of honeycomb. STRESS DETECTION. The detection and relief of the shrinkage stresses causing case- hardening, checking, and honeycombing is one of the most im- portant of the kiln operator's duties, and one wThich require
. Department bulletin. Agriculture; Agriculture. Fig. 4.—Development of a surface check into a honeycomb. 1, 2. nnd 3 show the check gradually closing up as the piece dries and shrinks. 4, 5, and 0 indicate how the tensile stresses deepen the bottom of the honeycomb as the casehardening becomes more severe. The depression along th<- center of the top, in 5 and ft. is typical of honeycomb. STRESS DETECTION. The detection and relief of the shrinkage stresses causing case- hardening, checking, and honeycombing is one of the most im- portant of the kiln operator's duties, and one wThich requires skill and close application. The usual method of detecting the presence of these stresses, com- monly called casehardening stresses, is to cut a stress section from an average board. This stress section should be cut at least 2 feet from the end of the board, and should be about 1 inch long in the direction of the grain. It is then slotted as shown in Figure 5, the number of slots depending upon the thickness of the board and upon the preference of the individual operator. Often it is desirable to. 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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Keywords: ., bookauth, bookcentury1900, bookdecade1920, booksubjectagriculture
