An apparatus for measuring the relative wear of sole leathers and the results obtained with leather from the different parts of a hide. . 137325°—la. (To face page 6.) FlG. 5.—Results of test No. 1 (ordinates indicate loss in wearing tests) Wear Resistance of Sole Leather 7 on the wheel were made to an apparent even thickness by backingthe thinner ones with sheets of metal so that the outer circumfer-ence of the wheel, after all the test pieces were in place, presenteda smooth surface. Twelve pieces were tested at one time. Thesame general scheme of placing the samples on the machine forthis t
An apparatus for measuring the relative wear of sole leathers and the results obtained with leather from the different parts of a hide. . 137325°—la. (To face page 6.) FlG. 5.—Results of test No. 1 (ordinates indicate loss in wearing tests) Wear Resistance of Sole Leather 7 on the wheel were made to an apparent even thickness by backingthe thinner ones with sheets of metal so that the outer circumfer-ence of the wheel, after all the test pieces were in place, presenteda smooth surface. Twelve pieces were tested at one time. Thesame general scheme of placing the samples on the machine forthis test was carried out as in Test No. i. The results of the tests are given in Fig. 6 and show that thebest wearing portions of the bend are along the backbone edge and. CubitCtarmatan. Fig. 6.—Results of test No. 2 (ordinates indicate loss in -wearing tests) over the kidney. The resistance to wear decreases as the bellyedge is approached and also toward the shoulder end of the No. j.—Test No. 3 differs from the preceding test mainlyin the fact that the leather was of hemlock tannage instead of oaktannage, and that the conditions of pressure and shear were chang-ed, so that no comparison can be made between the relative wearof the oak and hemlock tannages. The tests were made along thebend with samples of composition material placed alternately onthe machine with the leather. The general tendency of the de-creasing resistance to wear as the belly edge and the shoulder end Technologic Papers of the Bureau of Standards
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