16—ON THE DETERMINATION OF THEB–LCURVE BY CUTTING AND WEIGHING

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Abstract
The B–L curve of a yarn or sliver can be found by weighing pieces of the yarns cut to certain lengths. Though rather slow, this is an important method because any instrument such as an electronic one, that measures the coefficient of variation of weight per unit length indirectly must be checked by the cutting and weighing method. This paper describes a fairly quick method of determining the B–L curve by cutting and weighing. The method described in this paper embodies a new principle. No great originality is claimed for the concept of the coefficient of variation between a certain length within some other length, because one or two workers (for example H. Olerup1) have for some time viewed the description of yarn irregularity in this way. What is new, however, is a theoretical examination of the basis of the cutting and weighing method, which shows that a novel and rather surprising arithmetical procedure must be used in working out the coefficients of variation if the results are to be unbiased. This procedure is, as a matter of fact, simpler than the ordinary one. This paper describes a convenient simple apparatus for cutting the yarn under constant tension and discusses the theoretical basis for the experimental and arithmetical procedure.

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