Abstract
A method is described of obtaining load-extension diagrams of textile yarns and fibres with constant rate of loading throughout each test, and giving diagrams in rectangular co-ordinates. The novel point in the method consists in the application of the load through a spiral spring by the rotation of a torsion-head at constant speed. Two instruments are described—one for threads of strength between 50 and 500 grams, and the other for filaments and hairs of strength below 20 grams.

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