Three Methods of Determining Hardness of Increment Core Segments

Earl H. Tryon, Paul J. Litwin, John R. Hamilton, John J. Renton


Three methods were devised to measure the hardness of small wood samples: a sanding test, a diamond point indentation test, and a saw blade tooth deformity test. Based on step-wise multiple regression analysis with 19 and with five important independent variables, the sanding test was best, followed by the indentation test. The saw blade test gave poor results and was discarded. The order of important independent variables among the four plots analyzed individually showed a nearly perfect relationship with the sanding test, but no consistent order of the variables among plots for the indentation test. Again this indicated that the sanding test was best.


<i>Quercus rubra</i>;hardness tests;sanding;tool wear;sawing;machining

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