. Check list of the forest trees of the United States : their names and ranges. Forests and forestry; Trees. 44 Tested in coinpressioii endwise (fig. 29), the fibers act as so many hollow columns lirnily j^rowu together, and when the load becoines too great the piece fails in the manner illustrated in fig. .'Jl. This failure is a very complex phenomenon; in wood like pine the fibers of the plain in which failure occurs become separated into small bodies; they tear apart and cease to behave as one solid body but act as a large number of very small independent pieces. Like the strands o
. Check list of the forest trees of the United States : their names and ranges. Forests and forestry; Trees. 44 Tested in coinpressioii endwise (fig. 29), the fibers act as so many hollow columns lirnily j^rowu together, and when the load becoines too great the piece fails in the manner illustrated in fig. .'Jl. This failure is a very complex phenomenon; in wood like pine the fibers of the plain in which failure occurs become separated into small bodies; they tear apart and cease to behave as one solid body but act as a large number of very small independent pieces. Like the strands of a rope these small bodies ofler but little resistance to compression; thej^ bend over, and the piece '^ ; It is evident that a vertical position and a regular arrangement of the fibers increase the resistance and that therefore the medullary rays and oblique position of fibers in crossgrained and knotty timber tend to reduce the strength in com- pression. From the following table of strength in tension and compression it will be seen that these two are not always proportional, the stiffer conifers excelling in the latter, the t(nigher hard woods in the former: Fig. 29.—Coiupiessioii 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 Sudworth, George Bishop, 1862-1927; Roth, Filibert, 1858-1925. Timber : an elementary discussion of the characteristics and properties of wood; Carl A. Schenck Collection (North Carolina State University). NCRS. Washington, D. C. : Dept. of Agriculture, Forestry Division
Size: 1276px × 1958px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
