. Wood; a manual of the natural history and industrial applications of the timbers of commerce. Wood; Timber. 18 OF WOOD IN GENERAL a minimum of one two-hundredth of an inch (0-2 mm.).-^ Many local causes, especially exposure to wind, produce excentricity of growth, few trees presenting a truly circular cross-section or a truly central pith, though this is more common among pines than among other trees. Branches almost always present an excentrically oval section, the pith nearer to the upper surface. The summer-wood in each ring being darker, heavier, and Fig 12 â1 Piece of wood of S
. Wood; a manual of the natural history and industrial applications of the timbers of commerce. Wood; Timber. 18 OF WOOD IN GENERAL a minimum of one two-hundredth of an inch (0-2 mm.).-^ Many local causes, especially exposure to wind, produce excentricity of growth, few trees presenting a truly circular cross-section or a truly central pith, though this is more common among pines than among other trees. Branches almost always present an excentrically oval section, the pith nearer to the upper surface. The summer-wood in each ring being darker, heavier, and Fig 12 â1 Piece of wood of Spruce (JPicea eocUsa) â with the baik lemoved, natural si7e 2 A portion from the neaiest upper outside angle of 1, showing wood neai the outside of an annual rmg, magnified 100 times (Prom Hartig s Ttmbeis and koto to Inow than, by permission of Dr Somerville and Mr David Douglas ) its relative proportion to the spring-wood largely determines the weight and strength of the wood, so that colour becomes a valu- i Poplars grown m moist groimd may reach a diameter of 14 mehes in 8 years. Laslett lecords {Timber and Ttmher-trees, ed. 2, pp, 44-5) exceptionally fine English Oak and Elm, and an aveiage drawn from seveial specimens of Canadian Oak and Elm which gave the followmg number of imgs at 6, 12, 18, and 24 inches diameter: English Oak, - Canadian Oak, English Elm, - Canadian Elm, 5111 12 m 18 m. 24 in 13 19 24 30 49 105 160 216 10 16 25 36 80 156 252. 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 Boulger, George Simonds, 1853-1922. London, E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttimb, booksubjectwood
