内柱体双悬丝扭摆衰减粘度计至今无一适用于较寬枯度范围的公式。本文从简单的理论推导得出粘度与对数衰减率的大致关系,然后对其进行实验修正,得出粘度的半经验公式为。並验证了内柱体双悬丝扭摆的周期公式为,转动惯量的测定式为。此外还测量了内柱体的插入深度及偏心度与对数衰减率的关系。 To date, there is no formula for wide range of dead-zone viscometer. In this paper, the approximate relationship between viscosity and logarithmic decay rate is deduced from a simple theory, and then the experimental correction is made to obtain the semi-empirical formula of viscosity. The cycle formula of twisting yarn of double column in the inner column is also verified. The formula of moment of inertia is as follows. In addition, the relationship between the insertion depth and eccentricity of the inner cylinder and the logarithmic decrement rate was also measured.