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The purpose of this investigation was to obtain data on the effect of the speed of the pulling jaws of the testing machine on the tensile strength and stretch of leather. In practice, speeds as low as 0.25 in./min and as high as 12 in. /min have been used in different laboratories. In this study, 1,900 measurements of strength and stretch were made at 6 different jaw speeds, using a horizontal Scott machine of 800-lb capacity. The tensile strength increased with jaw speed, the rate of increase being least between 6 and 12 in. /min. The change in stretch with jaw speed was erratic ; tbe average difference between the stretch at 0.5 in. /min and that at 20 in. /min was 1 percent, or no greater than the smallest interval of stretch measured. CONTENTS Page L Introduction __  __   ____ __ ___ __ __   207 IL D escription of leathers used  ___   ____ ____ 208 III. Plan of the experiments  ___ ___ ___  208 IV. Results___  ___  ____     212 1. Tensile strength of experimentalleather __ ___ ___ __  __ __ 212 2. Stretch of experimelltalleatheL _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 213 3. Light leatheL ___ ____     __ 214 4. Commercial sole leather ___  __ ____ ____ ____ __ ___ ____ 214 V. Conclusion ___    _ 214

Effect of speed of pulling jaws on the tensile strength and stretch of leather