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Wool Fiber Measurements

North Dakota Agricultural Experiment Station

Abstract

A rapid, simple and accurate method has been presented for the determination of the wool fiber diameter. This method makes use of the audio oscillator and a vibrascope constructed from a "2" inch permanent magnet speaker. With this apparatus, the frequency is obtained at the maximum vibration of the wool fiber. The diameter of a vibrating wool fiber then can be calculated from the following equation:

Where D is the diameter of the wool fiber in microns, T is the tension in grams: d is the density of the fiber; L is the length in cm. and V is the frequency in cycles per second.

This method has been found useful for evaluating the quality of individual fleeces in a selection program, designed to reduce variability in fiber diameter.