The torsiometer - an instrument for the study of gels considered as elastic solids

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Abstract
A new instrument has been developed for studying changes in development of structure in the weak hydrogels produced when natural rubber latex from Hevea braziliensis is coagulated. The instrument records on a chart the progressive changes in torque required to give a fixed small value of deformation in an annular sample. The machine can be used for gel systems other than rubber, and may therefore have applications in other fields. Results may be expressed directly as a modulus of rigidity for materials with properties approximating to those of an elastic solid. For visco-elastic materials the modulus is a complex function including viscosity components. The range of sensitivity of the instrument is from 1 to 100,000 dyn/cm2.

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