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Excerpt from Progress Report on the Strength of Structural Timber
For flooring, molding, paneling, and all inside finish western hem lock makes a superior lumber, not easily scratched, susceptible of a high polish, and of excellent wearing qualities.
The results of the mechanical tests, although the data are not as yet sufficiently numerous for positive conclusions, indicate a quality of timber averaging about 70 per cent of the strength of red fir of the same grade, and suitable for all except the heaviest structures.
The tests of western hemlock recorded below were made upon tim bers cut on the west. Slope of the Cascade Mountains, in Lane County, Greg, and tested from two to six months after sawing. The sticks were stored in a shed and sprinkled from time to time. It is difficult to apply to the western hemlock the grading rules adopted for red fir. Their application throws most of the hemlock sticks into the seconds grade. New rules should be made for western hemlock to bring the better quality of sticks into the merchantable grade. The average of the results shown in Table I gives a modulus of rupture of pounds per square inch, a modulus of elasticity of pounds per square inch, and a dry weight per cubic foot of pounds. The rate of growth of these sticks was rings per inch.
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Progress Report on the Strength of Structural Timber (Classic Reprint)
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Paperback. Zustand: New. Print on Demand. This book presents findings from cross-bending tests performed on large structural timber beams made from various commercially available tree species in the United States. These findings are based on tests conducted at collaborating university laboratories using state-of-the-art machinery and involving beams of varying size, moisture content, and grading. The results offer valuable insights into the structural value of different species, particularly loblolly pine and western hemlock, and will aid in revising grading and inspection rules for timber. The book also includes detailed descriptions of the testing methods and equipment used to ensure the accuracy and reliability of the results. Through this comprehensive and rigorous testing program, the author provides crucial information for improving building codes and promoting efficient use of timber in construction. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781333139988_0
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