. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. picture would seem to indicate that specific gravity, and hence strength, could be controlled by silvicultural methods. Compression Parallel to Grain Typical failures (Fig. 20) corresponded with those expected in normal wood. Ilaximum crushing strength has been plotted over specific gravity for both the green and air-dry material. Figure 15 illustrates the relationship. Tixe difference in slope of the average regressions between the two types of material should be noted. The rat
. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. picture would seem to indicate that specific gravity, and hence strength, could be controlled by silvicultural methods. Compression Parallel to Grain Typical failures (Fig. 20) corresponded with those expected in normal wood. Ilaximum crushing strength has been plotted over specific gravity for both the green and air-dry material. Figure 15 illustrates the relationship. Tixe difference in slope of the average regressions between the two types of material should be noted. The ratio bet-z/een strength at proportional limit and maximum crushing strength was not constant, and the average of 75 percent for all tests was lower than the 80 percent expected for coniferous woods according to Markwardt and Wilson Modulus of elasticity was almost 25 percent higher than the same modulus in Pig. 15. —The relationship between maxiaum crushiner strength and specific gravity for green (?^ite circle) and for air-dry (black circle) Haitian pine* (I^a relacion entre la resistenoia maxima a la compresion y el peso espec£- fico del pino haitiano en estado ?erde (cfroulos blanoos) y en estado seco al aire (o£roulos negros) For the air-dry material a marked increase in strength and stiffness over green material was observed. Samples were well distributed throughout iV ^^arkwardt, L. J. and , Wilson. Strength and related properties of ^ods ^'rown in the United States. Dept. Agr., Tech. Bull. 479. 1935. - 213. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern Forest Experiment Station (New Orleans, La. ). Rio Piedras, P. R. : Tropical Forest Experiment Station, United States Forest Service
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