The Measurement of the Absolute Viscosity of Anomalous Fluids: I: The Measurement of the Time-dependence of Viscosity of Thixotropic Materials

The methods of measuring the absolute viscosity of anomalous fluids are reviewed briefly, and an improved method is given, which is an extension of Mooney's method, and which makes use of a simple concentric cylinder viscometer, It is shown that if a suitable technique is used information on the time-dependence of the absolute viscosity of thixotropic materials can be obtained either with this instrument or with a parallel disc viscometer.