. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 11.—Method of inserting tree fallcr in notch. Fig. 12.—Cut opened ahout 7 inches with tree faller. special pack boards used in carrying the parts in the woods. The amount of time consumed in taking down or assembling the machine is insignificant. Figure 11 shows the method of inserting the jack in place on the oscillating plates, also the jack ready for operation, with the roller on the jaws nearest the fulcrum set in the third cavity of the plate. At this point of the opera- tion the strain is greatest. Figure 12
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 11.—Method of inserting tree fallcr in notch. Fig. 12.—Cut opened ahout 7 inches with tree faller. special pack boards used in carrying the parts in the woods. The amount of time consumed in taking down or assembling the machine is insignificant. Figure 11 shows the method of inserting the jack in place on the oscillating plates, also the jack ready for operation, with the roller on the jaws nearest the fulcrum set in the third cavity of the plate. At this point of the opera- tion the strain is greatest. Figure 12 shows the cut opened 7 inches with the end roller (the one farthest away from the fulcrum) set in the third roller cavity of the plate. At this point the strain is least. The manufacturers of this device have spent sev- eral years in experimental work, building several dif- ferent types with several different kinds of steel. They now feel that the machine has passed the experimental stage. The principal difficulty has been in finding a steel that would stand the very trjdng service demanded of it. Jacks built of other steels than the kind now used stood the test for a while, and then broke under strains seem- ingly no more severe than those they had successfully withstood. It is to be hoped that the jack as now constructed will measure up to. 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
