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Teaching Wool Grading and Shrinkage Estimation

Wyoming Experiment Station

Abstract

In the past few years it has been generally accepted that thickness of fiber is one of the most important characters of wool which determine its commercial classification. It is true that other factors are quite important, but many of them are unmeasurable, and after all is said and done, the thickness of the fibers making up a sample of wool is the major factor in its commercial classification, even though other factors are also considered.

For a number of years the Wyoming Experiment Station has used the micrometer caliper as a means of teaching wool fiber thickness and thus giving the student a dimensional basis upon which to classify wool by grade. We have found that once a student has learned to judge the thickness of individual fibers, he has little difficulty in estimating the average thickness of a sample.