Abstract
A description is given of a new viscometer based, in principle, on the rotation of two identical Couette viscometers in opposite directions, also of its application to the study of anomalous viscosity, thixotropy, dilatancy, elastic recoil, yield value and the degree of dispersion of suspensions of solids in liquids. In addition a critical review is included of the precise meaning of rheological terms in so far as they can be illustrated by means of the new apparatus.