. Check list of the forest trees of the United States : their names and ranges. Forests and forestry; Trees. HARDNESS OF WOOD. 47 substance the material of the cell walls takes up about 50 cubic inches of water and thereby swells up, becoining about 150 cubic inches in volume. In keeping with this swelling the substance becomes softer and less resistant. In pine wood this diminution of resistance, accord- ing to experiments, seems to be about 50 per cent, and the strength of the substance therefore is inversely as the degree of saturation or solution. HARDNESS AND SHEARING ACROSS THE (iRAIN. W
. Check list of the forest trees of the United States : their names and ranges. Forests and forestry; Trees. HARDNESS OF WOOD. 47 substance the material of the cell walls takes up about 50 cubic inches of water and thereby swells up, becoining about 150 cubic inches in volume. In keeping with this swelling the substance becomes softer and less resistant. In pine wood this diminution of resistance, accord- ing to experiments, seems to be about 50 per cent, and the strength of the substance therefore is inversely as the degree of saturation or solution. HARDNESS AND SHEARING ACROSS THE (iRAIN. When the soli produce an indentation of one twentieth inch: Hickory, hard maple, osage orange, black locust, persimmon, and the best of oak, elm, and hackberry. 2. Hard woods requiring over 2,400 pounds per S(piare inch to pro- duce an indentation of one-twentieth inch: Oak, elm, ash, cherry, birch, black walnut, beech, blue beech, mulberry, soft mai)le, holly, sour gum, honey locust, coffee tree, and sycamore. 3. Middling hard woods, requiring over 1,000 pounds per square inch to produce an indentation of one-twentieth inch: The better qualities of Southern and Western hard ])ine, tamarack and Douglas spruce, sweet gum, and the lighter qualities of 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 Sudworth, George Bishop, 1862-1927; Roth, Filibert, 1858-1925. Timber : an elementary discussion of the characteristics and properties of wood; Carl A. Schenck Collection (North Carolina State University). NCRS. Washington, D. C. : Dept. of Agriculture, Forestry Division
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
