. Wood and forest . Curlv (iiained buiiy-Ieal-fine(full size;. Fijf 2S. Curl3-Yellow Poplar(full size). crooked-grained wood. See Fig. 27, curly long-leaf pine, and Fig. 28,yellow poplar. When such crookedness is fine and the fibers are con-torted and, as it were, crowded out of place, as is common in andnear the roots of trees, the cflect is called burl, Fig. 29. The termburl is also used to designate knots and knobs on tree tiunks. Fig. is used chiefly in veneers. 36 WOOD AND rORESX. Ivregularity of grain is often caused 1)y tlie presence of adventi-tious and doiniant buds, w
. Wood and forest . Curlv (iiained buiiy-Ieal-fine(full size;. Fijf 2S. Curl3-Yellow Poplar(full size). crooked-grained wood. See Fig. 27, curly long-leaf pine, and Fig. 28,yellow poplar. When such crookedness is fine and the fibers are con-torted and, as it were, crowded out of place, as is common in andnear the roots of trees, the cflect is called burl, Fig. 29. The termburl is also used to designate knots and knobs on tree tiunks. Fig. is used chiefly in veneers. 36 WOOD AND rORESX. Ivregularity of grain is often caused 1)y tlie presence of adventi-tious and doiniant buds, wliicli may be plainly seen as little knobson the surface of some trees under the baric. Iir most trees, theseirregularities are soon buried and smoothed over by the successive an-nual layers of wood, but in some woods there is a tendency to pre-serve the irreo-ularities. On slash (tangent) boards of such Fig-. 2). Kedwood Burl (full size) Fig. 3U. Mapl a great number of little circlets a]ipear, gi\-ing a beauiiful grain, asin Birds-eye maple, Fig. :^0. These markings are fmmd to pre-dominate in the inner part of the ti-ee. This is not at all a distinctvaiiety of maple, as is sometimes sup])(ise(l, but the common varietv,in which the jihcnomenon frequently appears. Logs of great value,having birds-eyes, have often unsusi)ectingly lieen chopped u]i forfire wood THE STRUCTURE OF WOOD. The term grain may also mean the figure formed by thepresence of pith rays, as in oak, Fig. 33, or beech, or the word grainmay refer simply to the uneven deposit of coloring matter as is com-mon in sweet gum, Fig. 33, black ash, or Circassian walnut. The presence of a limb constitutes a knot and makes great irregu-larity in the grain of wood, Fig. 34. In the first place, the fibers onthe upper and lowersides of the limb behavedifferently, those on thelower side running un-interruptedly from thes
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforests, bookyear1912
