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pendix I: Method of determining the effect of the rate of application of load on the strength of timber, pp. 325-327; App. II: A discussion on the effect of moisture on strength and stiffness of timber, together with a plan of procedure for future tests, pp. 328-334. HATT, WILLIAM KENDRICK: Relation of timber tests to forest products. Proc. Int. Assn. Test. Mat., 1906, C 2 _e_, pp. 6. ----: Structural timber. Proc. Western Ry. Club, St. Louis, Mch. 17, 1908. ----: Abstract of report on the present status of timber tests in the Forest Service, United States Department of Agriculture. Proc. Int. Assn. Test. Mat., 1909, XVL, pp. 10. ---- and TURNER, W.P.: The Purdue University impact machine. Proc. Am. Soc. Test. Mat., Vol. VI, 1906, pp. 462-475. HAUPT, HERMAN: formulae for the strain upon timber. Center of gravity of an ungula and semi-cylinder. Jour. Franklin Inst., Vol. XIX, 3d series, 1850, pp. 408-413. HEARDING, W.H.: Report upon experiments ... upon the compressive power of pine and hemlock timber. Washington, 1872, pp. 12. HOWE, MALVERD A.: Wood in compression; bearing values for inclined cuts. Eng. News, Vol. LXVIII, 1912, pp. 190-191. HOYER, EGBERT: Lehrbuch der vergleichenden mechanischen Technologie. 1878. IHLSENG, MANGUS C.: On the modulus of elasticity of some American woods as determined by vibration. Van Nostrand's Eng. Mag., Vol. XIX, 1878, pp. 8-9. ----: On a mode of measuring the velocity of sounds in woods. Am. Jour. Sci. and Arts, Vol. XVII, 1879. JACCARD, P.: Etude anatomique des bois comprimes. Mitt. d. Schw. Centralanstalt f. d. forst. Versuchswesen. X. Bd., 1. Hft., Zurich, 1910, pp. 53-101. JANKA, GABRIEL: Untersuchungen ueber die Elasticitaet und Festigkeit der oesterreichischen Bauhoelzer. I. Fichte Suedtirols; II. Fichte von Nordtirol vom Wienerwalde und Erzgebirge; III. Fichte aus den Karpaten, aus dem Boehmerwalde, Ternovanerwalde und den Zentralalpen. Technische Qualitaet des Fichtenholzes im allgemeinen; IV. Laerche aus dem Wienerwalde, aus Schlesien, Nord- und Suedtirol. Mitt. a. d. forst. Untersuchungswesen Oesterreichs, Wien, 1900-13. ----: Untersuchungen ueber Holzqualitaet. Centralblatt f. d. ges. Forstwesen. Wien, 1904, pp. 95-115. ----: Ueber neuere holztechnologische Untersuchungen. Oesterr. Vierteljahresschrift fuer Forstwesen, Wien, 1906, pp. 248-269. ----: Die Haerte des Holzes. Centralblatt f. d. ges. Forstwesen, Wien, 1906, pp. 193-202; 241-2
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