THEA 130 Lecture Notes - Lecture 3: Quarter Sawing, Softwood, Actual Size
25 Sep 2016
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Softwood coniferous trees with needle-like leaves: spruce, pine, fir. Hardwood deciduous with broad leaves: oak, maple, poplar. Stage scenery uses softwood: easy to manipulate and cheap. Parts of trees: bark protection, cambium layer ring growth starts. Carries and protects the trees" water system: sap wood very young wood (probably only a few years old) Evolved from the cambium layer: heart wood older wood (probably decades or even centuries old) Also called flat sawn: rift sawn. Much more desirable and expensive: quarter sawn. Much longer sticks than they are wide. The more defects = the lower the grade. Knots circular flaw where a branch once grew. Pitch pocket empty space where sap used to collect. Warping change in shape of the board caused by the grain. Common grades visible defects: usually used for construction, no. 1 common knots up to 1 which may fall out, some warping and twisting: no.
