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Silk hosiery ya.rns Yarying in number of threads from 2 to 9 and in number of turns of twist per inch from 5 to 36 were tested for breaking strength and breaking elongation at 70° F after various periods of exposure in relative humidities from 33 to 86 percent . The strengths of the yarns were not affected significantly by changes in relative humidity between 33 and 55 percent. The yarns were weaker above 55-percent relative humidity. The elongations of the yams increased with an increase in relative humidity of the air. The elongation, on the average, increased 1 percent with an increase in relative humidity from 33 to 43 percent, and 1.9 percent with an increase in relative humidity from 76 to 86 percent. The ayerage strength of all yarns was 3.41 g per denier when tested under standard conditions. This figure seems to be independent of the size of t he yarn. although the strength of a given size varies with the amount of twist. Some data are given on the breaking strength and elongation of one-thread raw silk. CONTENTS PlIge I. IntroducLion   ___   783 II. MateriaL _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 784 III. Test procedure ___    __ 784 IV. Test results ___   785 V. Conclusion ___  __  790

Strength and elongation of silk yarns as affected by humidity