. Bulletin of the Department of Agriculture. Agriculture; Agriculture. /ooo i mtm/i/. O O T/rf/rreo 3 - Butts T = Tops Fig. 3.—Effect of preservative treatment on the strength and stiffness of loblolly-pine stringers treated partially air dry. DOUGLAS FIR. Figures 5 and 6 show the strength and stiffness of treated and untreated stringers of green and seasoned Douglas fir, respectively, treated by the so-called " boiling;J process as used in this case. There appears to be a marked weakening of the breaking strength with the particular treatment used. The average breaking s
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. /ooo i mtm/i/. O O T/rf/rreo 3 - Butts T = Tops Fig. 3.—Effect of preservative treatment on the strength and stiffness of loblolly-pine stringers treated partially air dry. DOUGLAS FIR. Figures 5 and 6 show the strength and stiffness of treated and untreated stringers of green and seasoned Douglas fir, respectively, treated by the so-called " boiling;J process as used in this case. There appears to be a marked weakening of the breaking strength with the particular treatment used. The average breaking strength of the stringers tested green and after seasoning is 33 per cent and 39 per cent, respectively, less than the average strength of the natural stringers. The fiber stress at elastic limit also appears to be reduced, although to a somewhat less extent. In the green material no weakening is apparent in the stiffness. The seasoned stringers, however, show a falling off in stiffness in the treated material. Figure 7 shows the strength and stiffness of green * Douglas fir treated by the so-called "steaming" process. The breaking strength 1 The air-seasoned material is not yet tested, July, 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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