Published research has indicated that cotton strength increases as the specimen loading rate increases when measured by Stelometer and Pressley methods. This report describes an instrument designed to test 1/8 gauge bundles at constant rates of extension from 0.05 to 50 cm/min. A computer analyzes voltage signals from force and dis placement transducers. Pressley jaws hold the fiber bundles, and a Stelometer vice is used to load them in the jaws. Specimens are selected with a mechanized sampling and combing procedure. The method provides measurements of strength, elongation, modulus, and two forms of toughness.
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