. Bulletin of the Department of Agriculture. Agriculture; Agriculture. j\J9*^?Lru BULLETIN No. 286 Contribution from the Forest Service HENRY S. GRAVES, Forester. Washington, D. C. PROFESSIONAL PAPER September 27, 1915 STRENGTH TESTS OF STRUCTURAL TIMBERS TREATED BY COMMERCIAL WOOD-PRESERVING PROCESSES. By H. S. Betts and J. A. Newlin, Engineers in Forest Products, Forest Products Laboratory. CONTENTS. Object of the tests '.. 1 Material tested 2 Methods of treatment 3 Method of testing 4 Results of tests , 6 Deductions. 14 Publications relating to strength tests of various woods 15 OBJECT
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. j\J9*^?Lru BULLETIN No. 286 Contribution from the Forest Service HENRY S. GRAVES, Forester. Washington, D. C. PROFESSIONAL PAPER September 27, 1915 STRENGTH TESTS OF STRUCTURAL TIMBERS TREATED BY COMMERCIAL WOOD-PRESERVING PROCESSES. By H. S. Betts and J. A. Newlin, Engineers in Forest Products, Forest Products Laboratory. CONTENTS. Object of the tests '.. 1 Material tested 2 Methods of treatment 3 Method of testing 4 Results of tests , 6 Deductions. 14 Publications relating to strength tests of various woods 15 OBJECT OF THE TESTS. This bulletin presents the results of tests made by the Forest Service, in cooperation with the Illinois Central Railway and one eastern and two western wood-preserving companies, to determine how the strength of bridge stringers is affected by commercial creo- sote treatments. To do this, comparison was made between the strength of treated and untreated stringers of the same size and quality. The test timbers were selected by representatives of the Forest Service from stock furnished by the cooperators. The For- est Service requested that the treatments given the timbers by each of the cooperators be that used in its regular commercial practice. A Forest Service representative was present during the treatments and kept a record of the various conditions to which the material was subjected. The woods used were loblolly pine, longleaf pine, and Douglas fir. After treatment the loblolly and longleaf pine were shipped to the Forest Service timber-testing laboratory at Lafayette, Ind.,1 and the Douglas fir to the Forest Service timber-testing sta- tion, Seattle, 1 Formerly conducted in cooperation with Purdue University. 2 Conducted in cooperation with the University of Washington. Note.—This report is of interest to users of timber where strength is an important consideration. 1035°—Bull. 256—15. Please note that these images are extracted from scanned
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