TIMBER PHYSICS KAULIEU \VOKK. 



Kidder, F. E. Experiments at Maine State Collide on transverse strength of southern and white pine. Van Xosl rand's 

 Magazine, 1879, vol. -2. 



Experiments with yellow and white pine. Van Xostnuid's Magazine. 1880, vol. L':>. 



Experiments on the strength and stift'uess of small spruce beams. Van Xostraud's Magazine, 18SO, vol. 1M 



Influence of time on bending strength and elasticity. Journal of Franklin Institute, 18si>. Proceedings 



Institute of Civil Engineering, vol. 71. 



l.au/a. (iaetano, professor Massachusetts Institute of Technology. Address before American Society of Mechanical 



Engineers, describing the 50,000-pouud testing machine at \Vatertown Arsenal and tests of >trcngth of large 



spruce beams. Journal of Franklin Institute, 1883. 

 K'eport of Boston Maniifacturers' .Mutual Fire, Insurance Company of tests made with Watertown machine' 



on columns of pine, whitewood, and oak of dimensions used in cotton and woolen mills. See summary and 



tables of same in Burr's Elasticity and Resistance of the Materials of Engineering, p. 480. 

 Macdonald, Charles. Necessity of government aid in making tests of materials for structural purposes. I'aper read 



before the American Institute of Mining Engineers. Vim Xostrand's Magazine, 1882, vol. 27, p. 177. 

 Norton, Prof. W. A., Yale College. Results of experiments on the set of bars of wood, iron, and steel after a 



transverse set. Experiments discussed in two papers read before the National Academy of Science, 1874 and 



1X75. Published in Van Nostrand's Magazine, 1887, vol. 17, p. 531. 



Description of machine used is given in proceedings of the A. A. A. S., eighteenth meeting, 1861). 



Parker, Lieut. Col. F. 11., United States Ordnance Department. Report of tests of American woods by the testing 

 machine, United States Arsenal, Watertown, under supervision of Prof. C. S. Sargeut, for the Census Keport, 

 1880. Senate Ex. Doc. No. 5, Forty-eighth Congress, first session, 1882-83. 



Report of experiments on the adhesion of nails, spikes, and screws in various woods, as made at Watertown 

 Arsenal. Senate Ex. Doc. No. 35, Forty-ninth Congress, tirst session, 1883-84, and in report on tests of metals 

 and other materials for industrial purposes at Watertown Arsenal, 1888-89. 



Also in report on tests of iron, steel, and other materials for industrial purposes at Watertown Arsenal, 



1886-87, pp. 188, 189. 



Report on cubic compression of various woods, as shown by tests at Watertown Arsenal, 1885-86, in report 



on tests of metals, etc., for industrial purposes. 

 Philbrick, Professor, Iowa University. New practical formulas for the resistance of solid and built beams, girders, 



etc., with problems and designs. Van Xostrand's Magazine, 1886, vol. 35. 

 Pike, Prof. W. A. Tests of white pine, made in the testing laboratory of the University of Minnesota. Van Nos- 



traud's Magazine, 1885, vol. 34, p. 472. 

 Rothrock, Prof. J.T., University of Pennsylvania. Some microscopic distinctions between good and bad timber of 



the same species. Read before American Philosophic Society. 

 Smith, C. Shaler, C. E. Summary of results of 1,200 tests of full-size yellow-pine columns. See W. II. Burr's 



Elasticity and Resistance of the Materials of Engineering, pp. 485^90. 

 Thurston, Prof. R. H., Cornell University. The torsioual resistance of materials. Journal of Franklin Institute, 



1873, vol. 65. 



Experiments on torsion. Van Nostrand's Magazine, Jnly, 1873. 



Experiments on the strength, elasticity, ductility, etc., of materials, as shown by a new testing machine. 



Van Nostrand's Magazine, 1874, vol. 10. 



. The relation of ultimate resistance to tension and torsion. Proceedings of Institute of Civil Engineers, 



vol. 7, 1878. 

 . The strength of American timber. Experiments at Stevens Institute. Paper before A. A. A. S., 1879. 



Jonrual of Franklin Institute, vol. 78, 1879. 

 . Effect of prolonged stress upon the strength and elasticity of pine timber. Journal of Franklin Institute. 



vol. 80, 1880. 



Influence of time on bending strength and elasticity. Proceedings A. A. A. S., 1881. Proceedings Institute 



of Civil Engineers, vol. 71. 

 Watertown Arsenal. Summary of results of tests of timber at, in Ex. Doc. No. 1, Forty-seventh Congress, second 



session. See Burr's Elasticity and Resistance of Materials of Engineering, pp. 486 and 535. 

 Wellington, A. M., c. E. Experiments on impregnated timber. Railroad Gazette, 1880. 



ORGANIZATION AND METHODS. 



Although in the course of the investigations many minor and some more important changes 

 in methods became necessary, the general plan was iu the main adhered to. We consider it, 

 therefore, desirable to restate from the same bulletin such portions as will explain the methods 

 pursued. The work at the test laboratory at St. Louis, Mo., was described in full by Prof. J. B. 

 Johnson, in charge, and the methods in the examination of the physical properties of the test 

 material by the writer. 



There are four departments necessary to carry on the work as at present organized, namely: 



(1) The collecting department. 



(2) The department of mechanical tests. 



