Abstract
DURING the progress of the work described in Part I † certain improvements in apparatus and technique suggested themselves. The clamps have been improved so that they will hold fibres as fine as cotton and will not permit slipping during tests at low humidities when the surface hardness of the fibres becomes very great. A device has been provided whereby the two clamps may be handled as a unit during insertion of the fibre and can then be released from each other after being set up for measurement. An improved sectioning technique, developed for very short fibres, is described. Results on cotton stress-strain relation and elastic hysteresis in Celanese have been obtained. Maxwell's flow equation for plastic materials has been examined in its application to the present method.
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