Abstract
This paper is an attempt to present a unified picture of the process of stretching a yarn to its breaking point. This entails bringing together the consideration of two factors operative in determining the breaking tension. These factors, which hitherto seem only to have been dealt with separately, relate to the effect of twist on (a) the relative incidence of fibre slippage and breakage, and (b) the degree of non-siniultaneity of the breaks. The relevance of theories due to previous writers is discussed, and the predictions of the various theories are compared with experimental data.