An instrument used to measure the rheological properties of fluids (see Fig. 12). It consists of a fixed flat surface with a rotating cone above and a sample of the fluid sandwiched between them. The cone just touches the flat surface. The rotational speed and tapered gap defines the shear rate. The torque on the rotating cone that resists the motion defines the characteristic shear rate. The surface can be heated or cooled to determine the rheological properties as a function of temperature.

Fig. 12