. Circular. Agriculture; Agriculture -- United States. 20 CIRCULAR NO. 128, BUREAU OF PLANT INDUSTRY. impossible to select single strands for comparison. The hard filjers, however, present single strands sufficiently uniform and free from other strands to be selected for breaking, but they are not uniform enough to be directly compared, A coarse, hard fiber may break at a higher tensile strain than a finer one, yet the fine one may be much stronger when compared with equal bulk or weight for weight. Weight is more satisfactory for comparison than diameter or bulk and it is more easily determin
. Circular. Agriculture; Agriculture -- United States. 20 CIRCULAR NO. 128, BUREAU OF PLANT INDUSTRY. impossible to select single strands for comparison. The hard filjers, however, present single strands sufficiently uniform and free from other strands to be selected for breaking, but they are not uniform enough to be directly compared, A coarse, hard fiber may break at a higher tensile strain than a finer one, yet the fine one may be much stronger when compared with equal bulk or weight for weight. Weight is more satisfactory for comparison than diameter or bulk and it is more easily determined. For comparison, therefore, the breaking strain of each sample is computed to the conA^enient but arbitrary standard of a fiber weighing 1 gram per meter of Fig. 2.—Testing machmc with a capacity of 1 gram to 90 kilograms, used for determining the strength of hard fibers. In testing hard fibers the following method is pursued: Twenty fibers are selected from the sample and their length meas- ured, after which they are weighed and the total weight is di^aded by the total length, giving the average weight per meter. They are then broken, one at a time, in the testing macliine. (Fig. 2.) The average breaking strain divided by the average weight per meter gives the breaking strain per gram meter. The results of numerous tests of some of the principal hard fibei-s are given in Table III. H'ir. l:.'8]. 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. Bureau of Plant Industry. Washington, D. C. : U. S. Dept. of Agriculture, Bureau of Plant Industry
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