Foundation of Nondestructive Testing of Wood Products Contributions from an Industrial Research Engineer Friend K. Bechtel Robert J. Ross United States Department of Agriculture Forest Service Forest Products Laboratory General Technical Report FPL–GTR–280 September 2020 2.0 CLT average MOE (10 6 lb/in 2 ) E x E-computer MOE (10 6 lb/in 2 ) E y 2.1 2.2 2.3 2.4 2.5 0.9 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Linear least squares fit, 249 data points E y = –0.185 + 1.114 E x Coefficient of determination = 0.976