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THE INCLINATION OF THE FIBRILS IN THE CELL WALL AND ITS RELATION TO THE COMPRESSION STRENGTH OF TIMBER

E. W. J. PHILLIPS
Empire Forestry Journal
Vol. 20, No. 1 (July 1941), pp. 74-78
Stable URL: http://www.jstor.org/stable/42593569
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
THE INCLINATION OF THE FIBRILS IN THE CELL WALL AND ITS RELATION TO THE COMPRESSION STRENGTH OF TIMBER
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Abstract

As part of an investigation into the relation between anatomical structure and the maximum crushing strength of home-grown Sitka spruce (Picea sitchensis), the influence of the degree of inclination of the spirally arranged fibrils of the middle layer in the secondary tracheid wall was examined. A satisfactory method of determining the fibril angle from the slope of the ray pit apertures is described. The normal variation in fibril angle within the tree was determined and the causes of this are discussed. It is important to note that the major variation is associated also with variation in size and structure of the elements, and this should be borne in mind when correlating fibril angle with properties of the wood ; furthermore, in adult wood the angular variation is limited. No relation between fibril angle and crushing strength was found, and it is suggested that the positive relation found by other workers may have been due to the inclusion of wood near the pith or compression wood, both of which are characterized by a much higher fibril angle than normal adult wood, but differ also in other respects.

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