Measuring Localized Slope of Grain By Electrical Capacitance

Electrical capacitance was found to be effective for measuring localized slope of grain in lumber. When slope-of-grain measurements were taken incrementally every 1/4 inch along and across the faces of several 2 by 4 samples, accurate grain patterns around knots were graphically reproduced. The technique exhibits considerable promise as a means for providing localized slope-of-grain information to grain flow analysis models being designed to predict lumber strength.

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