Abstract
An account is given of an experimental investigation into the effects of the major parameters involved in threadline instability in the false-twist draw-texturing process when disc-friction twisting units are used. The effects are interpreted in the light of the critical yarn speed, the critical draw ratio, and the wavelength and amplitude of the tension surging described in Part I of this series. Tension surging in the texturing of fully drawn yarns and in crossed-belt friction- twisting is also considered.

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