. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 350 FORESTRY INVESTIGATIONS U. B. DEPARTMENT Otf AGRICULTURE. Weight and btrenqth of wood at different heights in the tree. Number tt ees used Average age of trees Numbei of feet from stump 0 6 10 20 30 40 50 .... 60 Strength of longleaf pine (pounds per square inch) Bending strength Compres- sion end wise (with grain). 56 150 (o\ei! 12,100 7, J50 100 too 11,650 7 200 9b 9b 10,700 6,800 88 93 10,100 6,500 Si 9,500 0,300 79 80 9,000 6,150 75 AJ 8,600 6,050 71 82 Specific weight
. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 350 FORESTRY INVESTIGATIONS U. B. DEPARTMENT Otf AGRICULTURE. Weight and btrenqth of wood at different heights in the tree. Number tt ees used Average age of trees Numbei of feet from stump 0 6 10 20 30 40 50 .... 60 Strength of longleaf pine (pounds per square inch) Bending strength Compres- sion end wise (with grain). 56 150 (o\ei! 12,100 7, J50 100 too 11,650 7 200 9b 9b 10,700 6,800 88 93 10,100 6,500 Si 9,500 0,300 79 80 9,000 6,150 75 AJ 8,600 6,050 71 82 Specific weight Lonulodf. 22 127 .751 lOh . 705 100 .674 ,96 80 . 500 84 560 80 5,59 77 528 n Loblolly. 14 113 620 106 .595 100 578 07 534 90 ,508 86 491 83 ,470 SO 470 79 Shot ilea,!. 12 131 .614 10') .">85 100 .505 07 523 90 496 85 SI 455 78 454 7S Mean of all three species. .Relative weight. 48 106 100 97 00 S5 SI 7% 77 Relative strength of lougleat pine Mean of com pression and bending. 56 100 97 90 S6 S3 79 76. 20 30 40 Feet from Stump. SO &) JTiGr. 91 —Variation of weight with height of 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 Fernow, B. E. (Bernhard Eduard), 1851-1923; United States. Forest Service. Washington, Govt. print. off.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
