The original rheometers; constructed at the Chem. Eng. Dept., Techn. Univ., Lodz, were designed for non-Newtonian fluids like polymer solutions, melts, pastes, suspensions, and emulsions. They included a capillary rheometer for molten polymers, another for solutions, still another provided with a stirrer intended for rapidly sedimenting suspensions, a rotational rheometer to monitor and control fermentation suspensions, a rotational low-shear rate rheometer, and an attachment to the commercial Rheotest rheometer for rapidly sedimenting suspensions.