An apparatus for measuring the relative wear of sole leathers and the results obtained with leather from the different parts of a hide. . (1) a driving(shearing) action under pressure, and (2) a slight abrasive actionresulting from the circular path of contact between the wheel anddisk. The conditions of pressure and shear may be adjusted asdesired. A circular brush is shown resting on the carborundumdisk. This brush in connection with a small exhauster tends tokeep the surface of the wearing disk clean. A test usually consists of 40 000 revolutions of the wheel whichcorresponds with 40 000 st
An apparatus for measuring the relative wear of sole leathers and the results obtained with leather from the different parts of a hide. . (1) a driving(shearing) action under pressure, and (2) a slight abrasive actionresulting from the circular path of contact between the wheel anddisk. The conditions of pressure and shear may be adjusted asdesired. A circular brush is shown resting on the carborundumdisk. This brush in connection with a small exhauster tends tokeep the surface of the wearing disk clean. A test usually consists of 40 000 revolutions of the wheel whichcorresponds with 40 000 steps, or approximately 40 miles of walking. The substitution of a wheel for the cam eliminated the bumpingaction but retained the shearing action and resulted in a moreeven and smoother operation. The use of a wheel allowed morespecimens to be tested at one time, the entire surfaces of whichwere subjected to the wearing action. By using carborundum foran abrasive, a material was obtained which did not become dullor smooth quickly and which could be resurfaced with an emery-wheel dresser. Bureau of Standards Technologic Paper No. 147. Fig. i.—Wearing test machine as first used
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Keywords: ., bookcentury1900, bookdecade1910, bookidapparatusfor, bookyear1919
