In previous studies methods were developed for calibrating the Arealometer readings A and D to optically-determined measurements of standard cotton fiber samples. In this paper similar principles are applied to the PH and PL readings obtained from the Shirley I.I.C. Fineness/Maturity Tester, using the same standards and optical measurements. The I.I.C. Tester is already calibrated to give the following equivalents: Micronaire, Causticaire, percent maturity, and linear density. The interrelations of these equivalents with appropriate optical measurements have been investigated.
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