Identification of the Economic Woods of the United States: Including a Discussion of the Structural and Physical Properties of WoodWiley, 1919 - Broj stranica: 157 |
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Stranica
... beams 38 " Ripple marks " 39 Growth rings . 40 Heartwood and sapwood 44 Grain and texture 46 Knots 48 Density and weight 49 Water content of wood 52 Shrinkage , warping , and checking Hygroscopicity Permeability Conductivity • 111.
... beams 38 " Ripple marks " 39 Growth rings . 40 Heartwood and sapwood 44 Grain and texture 46 Knots 48 Density and weight 49 Water content of wood 52 Shrinkage , warping , and checking Hygroscopicity Permeability Conductivity • 111.
Stranica 37
... grains . Pith flecks have a pathological origin . They are due to the work of cambium miners whose tunnels are filled by the tylosal development of adjacent uninjured parenchyma cells , especially of the cortex . The dissolved cell ...
... grains . Pith flecks have a pathological origin . They are due to the work of cambium miners whose tunnels are filled by the tylosal development of adjacent uninjured parenchyma cells , especially of the cortex . The dissolved cell ...
Stranica 42
... grain ) produces comparatively light , porous wood composed FIG . 13 . arpf- Zpri S. p.T. FIG . 14 . FIG . 13. - Quercus macrocarpa ( bur oak ) : cross section through three entire growth rings showing very large pores in early wood and ...
... grain ) produces comparatively light , porous wood composed FIG . 13 . arpf- Zpri S. p.T. FIG . 14 . FIG . 13. - Quercus macrocarpa ( bur oak ) : cross section through three entire growth rings showing very large pores in early wood and ...
Stranica 43
... grain contains a greater proportion of late wood and con- sequently possesses greater weight and strength than when very fine or very coarse grained . In this connection the following statement of H. Mayr * is interesting : " Assuming ...
... grain contains a greater proportion of late wood and con- sequently possesses greater weight and strength than when very fine or very coarse grained . In this connection the following statement of H. Mayr * is interesting : " Assuming ...
Stranica 46
... GRAIN AND TEXTURE Grain is a general term used in reference to the arrangement or direction of the wood elements and to the relative width of the growth rings . To have specific meaning it is essential that it be qualified . The kinds ...
... GRAIN AND TEXTURE Grain is a general term used in reference to the arrangement or direction of the wood elements and to the relative width of the growth rings . To have specific meaning it is essential that it be qualified . The kinds ...
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absent Acer Anatomy Betula bordered pits brown cambium Catalpa Cedar cell walls cells high cells wide Comparative Anatomy cross section DEBARY dense Dicotyledons distinct early wood elements Esculus Forestry Fraxinus grain growth ring Guaiacum Gymnosperms Hardwood Record heartwood heartwood and sapwood Hicoria IRVING W Juglans Juniperus Juniperus virginiana late wood Leitneria lens Liquidambar Liriodendron Magnolia MAXWELL numerous Odor perforations simple phloem Pine Pinus Pith flecks pits into ray Platanus Plate Populus Pores in late portion Quercus radial ray cells half-bordered Ray parenchyma ray tracheids resin resin cells resin ducts Robinia sapwood Sassafras scalariform Sequoia simple pits soft species stem structure surface tangential Taxodium Texture Tilia Timber Toxylon tree tyloses U. S. Dept U. S. Div U. S. Forest Service Ulmus unaided eye usually Vessels without spirals wood fibres Wood parenchyma Wood-using Industries xylem
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