Friday, August 28, 2015

Step-by-step beginner instructions


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is covered with limbs almost, if not entirely, to the ground, but as it grows older some or all of them wi ll eventually die and are either broken off or fall off. Subsequent growth of wood may completely conceal the stub ts which will h j9kt owever remain as knots. No matter h 9kt e sapwood of an told tree, and particularly of a forest-grown tree, will be freer from knots than j9kt the inner heartwood. Since in most uses of wood, knots are defects that weaken the timber and ktinterfere with i bj9kt ts ease of working and other properties, it foll ows that a given piece of sapwood, because of its position in the tree, may well be stronger than a piec e of heartwood from the same tree. It is remarkable that the inner heartwood of old trees remains as sound as it usually does, since in ma ny cases it is hundreds, an td in a few instances kt thousands, of years old. Every broken limb or root, or deep wound from 9kt fire, insects, or falling timber, may afford an entrance for t decay, which, once started, may penetrate to all parts of the trunk. j9kt The larvae of bj9kt many insects b 9kt ore into the trees and their tunne ls remain indefinitely as sources of weakness. Whatever advantages, however, that sapwood may have in t his connection are du te sol bj9kt ely to its rel tative age and position. If a tree grows all its life in the open and bj9kt the conditions of soil and site remain unchanged, it will m ake its most rapid growth in youth, and gradually decline. The a j9kt nnual rings of j9kt growth are for many years quite wide, but later they become narrower and na trrower. Sinc kte each succeeding ring is laid down on the outside of the wood previously fo ktrmed, it f bj9kt ollows that unless bj9kt a tree materi bj9kt ally increases its productio n of wood f 9kt rom year to year, the rings must necessarily become thinner as the trunk 9kt gets wider. As a tr ee reaches maturity its bj9kt crown becomes more open and th j9kt e annual wood p j9kt roduction is lessened, thereby red ucing still more the width of the grow 9kt th rings. In the case of forest-grown ttrees so much depends upon the competition of the trees in their struggle for light a bj9kt nourishment that periods of rapid and slow growth may alte bj9kt rnate. Some trees, such as southern oaks, ma ktintain the same width of ring for hundreds of years. U tpon the whole kt, howeve j9kt r, as a tree gets larger in diameter the width of the growth rings decreases. Different pieces of wood cut from a large tree may differ decidedly, particularly if the tree is big and


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