Indian Central Cotton Committee Technological Laboratory The Foundations of Yarn-Strength and Yarn-Extension August 1930

Measurements of the distrbution of twist were made in two series; in the first series the thin piece of the yarn was inserted in the revolving jaw and the thick piece in the fixed jaw; while in the second series the thick piece was inserted in the revolving jaw and the thin piece in the fixed jaw. [...] of Fibres it cross-section 0.811 (Hi:5 It is remarkable that the ratio of the dianu is practically the same as that of the yarn-eights per unit length and of the numbers of fibres in the cross-section the average value of all the ratios being o.62. [...] Were the concentration of fibres to be the same in the thick and thin places one would expect the ratio of the diameters to be the square root of the ratio of the numbers of fibres in the crossection i.e. [...] The question may be Aced: How is it pmg4ible for the fibre-strength -utilised" in the yarn to exceed zoo per cent." The answer is that the possibility arises from the fact that the fibre-strngth is merely the strength of the weakest part of the tibre and that as 'villaid out in Part II " the doubling together of many fibres to form a yarn makes it pts..iible for the weakest place of a fibre to [...] (31 The distribution of twist in a yarn of varying diameter is such that the number of turns of twists in any part of the yarn is approximately iversely proportittnal to the number of fibres in that part; as a consequence of this unequal distribution c if twist the diameter of the yarn at any given rom-section is directly proportional to the number of fibres at that cros4ection.