The responses of tension in a running yarn given stepwise friction at two points and drafted stepwise at two other points in the winding system have been studied with the following results:
Assuming the yarn to be perfectly elastic, the tension is readily calculable and agrees well with experimental results on nylon and cotton yarn. To make a more exact estimate, the effects of tension “Career” and creep of the yarn must be taken into consideration. “Career” means the amount of tension a sample received being used in our experiments.

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This article discusses theoretically the mechanism of a woven selvage line and establishes basic knowledge about, among other things, its dynamic construction, the differences between the selvage and the body of a fabric, the process of stabilizing the form of a selvage.

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Evaluation of the handling of a fabric yields two different values because of its elastic anisotropy. This is inconvenient for practical purposes.
The disk-vibrating method suggested in this article expresses handling in flexural rigidity. The author has devised a simple type of equipment and made experiments with it. Briefly, the experiment consisted of clamping a specimen in a circumference and vibrating it with the sound of a speaker. The idea was to find out the resonant frequency of the specimen while it was on the equipment. The experiment showed that the flexural rigidity of the specimen was expressible as a single value by the theory of disk vibration.
The result of the experiment by this method agreed well-in ranking correlation-with the results of tests by the cantilever method or the reed-vibrating method.
This new method is suitable for fabrics, but cannot be applied to membraneous materials, such as thin film.

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