Effect of moisture upon the strength and stiffness of wood Volume 63-71

 
9781236366375: Effect of moisture upon the strength and stiffness of wood Volume 63-71
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ... Fig. 6.--Individual moistureostrength curves for 10 series of spruce, compression parallel to grain. groups and plotted on two or more sheets, to be subsequently combined. This was done with the spruce end compression tests, consisting of 16 series, which were plotted upon three separate sheets, to prevent confusion by undue overlapping of the points. (See fig. 6.) The series curves were drawn as smooth lines among the respective points by means of splines. The soaked points, which usually fell far out of line with the others, as already explained (p. 18), were discarded in drawing the curves. This stage of the process is a Except the elastic limits for longleaf pine compression and beams, which were plotted, and a single curve drawn for each. shown by fig. 5, which is the original plate for the longleaf pine compression curves. Sometimes a series was found to be too irregular to form a reliable curve and was discarded in the final average. Having obtained the individual-series curves, these were then averaged together (the strength values being averaged for definite moisture per cent values) and the final average curve drawn through the points thus obtained. This process of drawing separate curves for each series and then averaging these curves gives more reliable results than could be obtained by averaging the individual points directly; for the latter procedure would involve a cross averaging of moisture as well as of strengths, since the moisture per cents are not constant throughout each set. Plotting all of the individual points furthermore allows of better judgment in determining the position of each average curve. The greatest variation, above and below, of any single point used in deriving the general average curve was calculated in percentage of ...

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