. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JSW&*<&SL BULLETIN No. 556 Contribution from the Forest Service HENRY S. GRAVES, Forester. Washington, D. C. PROFESSIONAL PAPER September 15, 191? MECHANICAL PROPERTIES OF WOODS GROWN IN THE UNITED STATES. By J. A. Newlin, In Charge of Timber Tests, and Thos. R. C. Wilson, Engineer in Forest Products. CONTENTS. Page. Purpose of the study 1 Scope and method of experiments 3 Precautions to be observed in the use of the data 4 Data on green timber 7 Data on air-dry timber 7 Explanation of Tables 1 and 2 7 Page.
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JSW&*<&SL BULLETIN No. 556 Contribution from the Forest Service HENRY S. GRAVES, Forester. Washington, D. C. PROFESSIONAL PAPER September 15, 191? MECHANICAL PROPERTIES OF WOODS GROWN IN THE UNITED STATES. By J. A. Newlin, In Charge of Timber Tests, and Thos. R. C. Wilson, Engineer in Forest Products. CONTENTS. Page. Purpose of the study 1 Scope and method of experiments 3 Precautions to be observed in the use of the data 4 Data on green timber 7 Data on air-dry timber 7 Explanation of Tables 1 and 2 7 Page. Explanation of Table 3 18 Glossary 20 Formulas used in computing 24 Table 1 26 Table 2 37 List of publications and papers dealing with the mechanical properties of timber 46 PURPOSE OF THE STUDY. This publication on the mechanical properties of wood makes available for general use data which will serve as a basis for (1) the comparison of species, (2) the choice of species for particular uses, and (3) the establishment of correct working stresses. The increasing scarcity of many species of timber which had become more or less standard in various wood-using industries is opening the field for other species. Through long use the properties which make the standard species valuable for a particular purpose are quite well understood, but it is doubtful if many manufacturers know to what extent other species possess those same qualities and to what extent they might replace the standard species. Present conditions will not permit long, tedious, and expensive experiments with com- mercial forms to establish new species in the industries; and to avoid this it is necessary to have definite information and data on both the new and the old species. With such test data at hand it is possible to compare the properties of a known species with those of any other. The possibility of substitution generally reduces to the few species which possess qualities approaching those previously in use.
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