Abstract
The number of twist, and the untwisting moment of a spring with different helical angle, made by nylon fish line, are measured by the usual moment tester, for the study of the mechanism of the stretched yarn.
The results obtained by previous investigation may be explained by the following considerations;-
(1) The fact that early in its untwisting operation reverse twists that appear, may be explained by the energy that the reverse twists have lower energy tha untwisted normal twist.
(2) The results that the sum of normal and reverse twists are always kept constant until all the normal twists change to reverse twists are derived from the constant helical angle throughout in the constant length untwisting.
