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A Clipper for Obtaining Wool Density Samples

U. S. Department of Agriculture

Abstract

In order that wool growers may select fleeces with greatest density to improve their flocks, an accurate method for securing small density samples rapidly has been urgently needed. Density methods requiring the use of various forms of calipers are described by Wildman (1936), Burns (1931), and Nordby (1928). These procedures are so time-consuming that they have been limited in their application. Hardy (1934) developed a shearing technique to measure wool density in which an area is sheared and measured and the wool removed for density measurements. It has proved satisfactory for wool scouring samples, but requires too large a sample to evaluate directly the number of fibers per unit area. This method as pointed out by Madsen, et al. (1941), furnishes such a large sample, that some of the variabilities in density are masked.

A new principle has been incorporated in the new density clipper device described in this paper.

¹ Senior Animal Husbandman, Animal Fiber Investigations, Beltsville, Md.