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Figure 13. This is a photograph of a cross section (marked transverse section), a radial section, and a tangential section of yellow-poplar, a diffuse porous species. Earlywood pores are not obvious at this magnification, unlike in ring porous species. FLATSAWN AND QUARTERSAWN BOARDS. Boards that are cut parallel with the bark (and therefore perpendicular to the rays along the tangential plane) are said to be flatsawn or plainsawn boards (synonymous terms) (see Figure 14, copied from the Wood Handbook4). As seen from the ends of the boards, the growth rings are oriented from 0° to about 35° to the wide edge of the board. Boards that are cut with the wide face more-or- less parallel with the rays (cut to emphasize radial surfaces with the growth rings oriented at roughly 65°–90° to the wide edge of the board) are said to be quartersawn. Some boards, of course, will fall between these two categories, and these boards are termed riftsawn. Depending on the market and the producer’s willingness to sort his wood, lumber may be sold in two categories: quarter- and riftsawn (combined), and flatsawn. Quartersawn 4 Forest Products Laboratory. 2010. Wood Handbook—Wood as an engineering material. General Technical Report FPL-GTR-190. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 508 p. https://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr190.pdf. Figure 3-14. 21PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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