. Bulletin. Forests and forestry. 31 When a fresh-cut timber is exposed to the air or to artificial heat, water naturally evaporates first from the surface. A thin outer layer may be almost perfectly dry while the interior remains nearly green. Let us suppose a heavy timber to be dried approximately as far as the dotted line in figure 7. This outer shell cannot, of course, shrink except within its own thickness, for to contract as a whole it would have to compress the wet core. So, being partly dry, it hardens or *'sets" in the form and size determined by its own shrinkage and by the size
. Bulletin. Forests and forestry. 31 When a fresh-cut timber is exposed to the air or to artificial heat, water naturally evaporates first from the surface. A thin outer layer may be almost perfectly dry while the interior remains nearly green. Let us suppose a heavy timber to be dried approximately as far as the dotted line in figure 7. This outer shell cannot, of course, shrink except within its own thickness, for to contract as a whole it would have to compress the wet core. So, being partly dry, it hardens or *'sets" in the form and size determined by its own shrinkage and by the size of the core. This is called ''; Generally, the shell cracks more. 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 Philippines. Bureau of Forestry. Manila, Bureau of printing
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
