Carter Holt Harvey Limited

Brian Andrew Rawley

Michael Kenneth Andrews

Paul David Harris

Peter Charles Stratton Carter

Marcus Jean Francois Lausberg

Use of a single end testing of stems of felled trees whereby by inducing a sonic wave with an impact and by reference to detected reflections and with a knowledge of the length of the stem the stiffness and/or strength characteristics of the stem or logs to be cut therefrom can be derived. A preferred procedure is a determination of the fundamental frequency f which relates to velocity V, the speed of longitudinal compressional motions along the stem, and L, the length of the stem, as follows: V&equals;2Lf . From that value V or a function of V can be derived an indicator of stiffness and/or strength.

Growing community of inventors

Tokoroa, New Zealand

Brian Andrew Rawley