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of radial surfaces in a piece of wood (though you’d have to make saw cuts to expose them). The tangential surface is any surface parallel to the bark; like the radial surfaces, there can be an infinite number of tangential planes exposed if you wanted to go to the trouble of cutting them. (See Figure 11.) Figure 11. This sketch labels the cross section, radial surface and the tangential surface on a wedge of wood.2 Ring porous species are said to have a more open grain than diffuse porous species. The appearance of the large earlywood pores is quite pronounced on the side grain in ring porous species. In contrast, no such distinction exists in diffuse porous species where all the pores are essentially the same size. See the photographs of white ash (ring porous) in Figure 12 and yellow-poplar (diffuse porous) in Figure 13.3 2 Source: Anonymous, 1993. An Introduction To Wood Anatomy Characteristics Common To Softwoods & Hardwoods. Publication FOR-59, published by the Cooperative Extension Service, College of Agriculture at the University of Kentucky. http://www2.ca.uky.edu/agcomm/pubs/for/for59/for59.pdf 3 These figures are photographic reproductions, made by this author, of actual thin wood sections prepared by Romeyn B. Hough and published by him in a fifteen volume set with plates representing twenty-five different North American species per volume. Hough’s The American Woods was self-published between 1888 and 1913. 19PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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