Abstract
IT is well known that wool fibres and human hair can be stretched 30 per cent in water at low temperatures (22° C.) without significant alteration of their elastic properties, provided that extension is carried out rapidly and release is immediate1. The released fibre returns exactly to its original length, and if it is allowed to stand in cold water for twenty-four hours before being re-stretched, the second -load-extension curve is almost identical with the first: the reduction in work for 30 per cent extension is only about 3 per cent in the case of human hair. If, however, the fibre is stretched rapidly and then held at 30 per cent extension for twenty-four hours at 22° C. before release, the reduction in work, again after twenty-four hours rest in water, is 45·5 per cent2.
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