Spiral Crain In East African Exotic Softwood Forest Plantations

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Date
1967/1968
Authors
Paterson D. N.
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Abstract
The strength of timber can be reduced by 10 per cent and 25 percent if the inclination of the grain reaches 5 ° and 8 respectively [3]. These are serious reductions in strength, but even so, they might be tolerated. Grain angles exceeding the above limits make timber of doubtful value for structural purposes and cause of this {he East African Softwood Stress Grading Rules ~specify that in five grades, grade 1 or better shall be less than 5 0. grade 2 or better less than 8°, but grades 3 and 4. regarded as non-structural grades, may have unlimited grain angle.
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East African Agricultural And Forestry Journal, 33, p. 286-291