. Timber and timber trees, native and foreign . Timber; Trees. thirds the semi-diameter of the tree. This is of serious consequence to the converter who has to deal with it, as the defect completely separates the concentric layers into segments of cir- cles. The simplest form in which we find this shake (Figs. 8 a and b), is that of a straight line crossing the pith, and taking a direction in the same plane through the length of the stem. It will, however, be FIG. 8a. found in some speci- mens to have taken a twisting form, and on examining the top of the tree, the shake may be nearly at right
. Timber and timber trees, native and foreign . Timber; Trees. thirds the semi-diameter of the tree. This is of serious consequence to the converter who has to deal with it, as the defect completely separates the concentric layers into segments of cir- cles. The simplest form in which we find this shake (Figs. 8 a and b), is that of a straight line crossing the pith, and taking a direction in the same plane through the length of the stem. It will, however, be FIG. 8a. found in some speci- mens to have taken a twisting form, and on examining the top of the tree, the shake may be nearly at right angles to that at the butt- end (Fig. 9). This is about the worst form, as it would involve a most serious loss in the conversion of the log if it were an ob- ject to reduce it into plank, and often ne- cessitates its being employed in bulk. The twist in the heart-shake just re- ferred to is pro- bably the result of an effort made by the tree to turn upon its base, which, I should think, might happen to trees produced in dense forests, where light and air are. FIG. % 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 Laslett, Thomas. London : Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1875
