Results are reported on tests of breaking load and elongation of single fibers at constant specimen length from the length groups of 6 cotton samples. A description is given of the instrument used in these tests. Average weight fineness of the center section of fibers from each length group was determined, and the tenacity and "stiffness" of the fibers were calculated.
A method is described of calculating a single-fiber tenacity "index" for a cotton sample from the tenacity values of 3 modal-length groups. A high correlation is demonstrated between this index and the weighted mean single-fiber tenacity for the whole sample.
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