A Report of Research on the Machine-Grading of Lumber in Britain

The Princes Risborough stress-grading machine measures the deflection of structural lumber under a fixed load applied to the face. It thus affords a measure of stiffness as a criterion of bending strength. There is no significant advantage in testing the material on both flat faces over loading on a single face, and the evaluation of density does not add to the reliability of the correlation.

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