. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. TIMBKR PHYSICS—METHODS. 395 CKOSS BREAKING TEST. Longleaf pine. fS. Mark, 3. |l. Length, 60.0 inches. Height, 3.50 inches. Jireadth, 3.72 inches. [Number annual rings per inch=23.] 60QO [ Strength of extreme fiber, 3 IF 7 where f=efyry= 10,230 pounds per square inch. Modulus of elasticity =1,760,000 pounds per square inch. Total resilience =5,110inch-pounds. El. Res., 1,780. Resilience, per cubic inch =6.54 inch-pounds. El. Res., 2.28. July | 20,1891. Load. i h. m. ' 2 58 200 3 0

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. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. TIMBKR PHYSICS—METHODS. 395 CKOSS BREAKING TEST. Longleaf pine. fS. Mark, 3. |l. Length, 60.0 inches. Height, 3.50 inches. Jireadth, 3.72 inches. [Number annual rings per inch=23.] 60QO [ Strength of extreme fiber, 3 IF 7 where f=efyry= 10,230 pounds per square inch. Modulus of elasticity =1,760,000 pounds per square inch. Total resilience =5,110inch-pounds. El. Res., 1,780. Resilience, per cubic inch =6.54 inch-pounds. El. Res., 2.28. July | 20,1891. Load. i h. m. ' 2 58 200 3 0 . 1,000 1 ' 1,600 2 , 2,000 3 ' 2,400 4 2,800 5 3,200 6 3,600 7 4,000 8 4,400 9 4,800 13 i 5,180 Deflec- Micro - tion. meter. 042 0.958 .208 1.124 .324 1.240 .404 1.320 .481 1.397 .558 1.474 .640 1.556 .721 1.637 .815 1.731 .926 1.842 1.074 1.990 1.544 2.460 Remarks.. Maximum load. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Fernow, B. E. (Bernhard Eduard), 1851-1923; United States. Forest Service. Washington, Govt. print. off.

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