Wood Handbook; Basic Information on Wood as a Material of Construction with Data for Its Use in Design and SpecificationU.S. Government Printing Office, 1955 - 528 páginas |
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Wood Handbook: Basic Information on Wood as a Material of Construction with ... Vista completa - 1955 |
Términos y frases comunes
air-dry applied Baldcypress basic stress beam bending boards bolt cedar chemicals coating color column compression compression members connector construction creosote cross section cubic foot diameter Douglas-fir Eastern eastern white pine edge effect F FIGURE face factor fibers finish flooring formula glue glued grade growth ring hardwoods heartwood heat hemlock illus impregnated inches thick increase insulation joints joists knots laminated length less load lumber manufactured maple material moderately modulus of elasticity moisture content nails paint panels parallel to grain penetration pentachlorophenol perpendicular piece plies plywood poles pounds preservative Processed resin sapwood seasoned shear shear stress shrinkage side softwoods southern yellow pine species specific gravity spruce stain standard strength properties strength ratio structural summerwood surface temperature tension tests timber treated treatment trees U. S. Forest Prod usually values veneer weight western western redcedar width Wood-Preservers zinc chloride
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Página 136 - Moisture affects the strength of structural timbers both directly and indirectly. The direct effect of loss of moisture is the stiffening and strengthening of the wood fibers. This increase in strength, however, is accompanied by checking, splitting, warping and twisting; as a consequence, some of the strength due to drying is lost.
Página 481 - Imperfect manufacture includes all defects or blemishes which are produced in manufacturing, such as chipped grain, loosened grain, raised grain, torn grain, skips in dressing, hit and miss, variation in sawing, miscut lumber, machine burn, machine gouge, mismatching, and insufficient tongue or groove.
Página 480 - ... is more often used. Coarse-Grained Wood — Wood with wide conspicuous annual rings in which there is considerable difference between springwood and summerwood. The term is sometimes used to designate wood with large pores, such as oak, ash, chestnut, and walnut, but in this sense the term "coarse textured
Página 487 - ... tangential — strictly, coincident with a tangent at the circumference of a tree or log, or parallel to such a tangent. In practice, however, it often means roughly coincident with a growth ring. A tangential section is a longitudinal section through a tree or limb perpendicular to a radius. Flat-grained lumber is sawed tangentially.
Página 131 - Hrtwd. — heartwood. ls&2s. — Ones and Twos — a combined grade of the hardwood grades of Firsts and Seconds. In. — inch or inches. Also two accent marks ("). J&P— joists and planks.
Página 488 - Weathering. The mechanical or chemical disintegration and discoloration of the surface of wood that is caused by exposure to light, the action of dust and sand carried by winds, and the alternate shrinking and swelling of the surface fibers that come with the continual variation in moisture content brought by changes in the weather.
Página 483 - Factory and shop lumber: Lumber intended to be cut up for use in further manufacture. It is graded on the basis of the percentage of the area which will produce a limited number of cuttings of a specified, or of a given minimum, size and quality.
Página 481 - The term has no reference to the actual hardness of the wood. Angiosperms is the botanical name for hardwoods.
Página 396 - MACLEAN, JD 1950. RESULTS OF EXPERIMENTS ON THE EFFECTIVENESS OF VARIOUS PRESERVATIVES IN PROTECTING WOOD AGAINST MARINE-BORER ATTACK. US Forest Prod.
Página 488 - Wane. — Bark or lack of wood from any cause on edge or corner of a piece. Warp. — Any variation from a true or plane surface. Warp includes bow, crook, cup, and twist, or any combination thereof.