A new simple absolute viscometer for use in experimental systems with limited access to the liquid

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Abstract
A novel type of vertically oscillating bob viscometer for liquids is described. The mathematical theory of a solid sphere oscillating in a viscous liquid is developed, and results in an exact equation depicting the relationship between the logarithmic decrement of the oscillations of the sphere and the viscosity of the liquid surrounding the bob. The use of this technique for the determination of absolute viscosity of liquids is demonstrated. Using five sample liquids, at room temperature, the average error between the absolute viscosities determined and those of previous measurements is ± 1.5%.The viscometer consists of a quartz spring, which suspends a solid gold sphere, hanging vertically. The oscillations of the system are sensed by electrically recording the output of a linear variable differential transformer, the core of which forms a part of the oscillating system. The oscillations are stimulated electrically; the positioning of the transducer core is precisely adjustable with the use of an electric motor driven mechanism. Thus, the viscometer can be entirely remotely controlled and is, therefore, recommended for experimental situations which make the liquid not easily accessible, e.g. inside furnaces, pressure vessels, vacuum chambers, etc.

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