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Abstract
Studies of the torsional properties of single fibres of Rambouillet 70s-quality, Rambouillet × Chokla 58s-quality, and Chokla 48s-quality wools are reported. The torsional rigidity of wool fibres is found to be proportional to the 3.8th power of the diameter. The rigidity modulus decreases with increasing fibre diameter. This variation of the modulus is explained as being due to variation of the structural components with breed type and diameter. Anisotropy of the fibre material and the fullness of yarns spun from the wools examined are discussed.