When a liquid is placed in a vessel held by a torsional suspension and the whole is set in rotation about a vertical axis, the viscosity of the liquid may be deduced from observations of the time period and decrement of the oscillations. This method of measuring viscosity has many practical advantages, but there are mathematical difficulties in making the calculations. The cases of spherical and cylindrical vessels are considered in detail and formulae are obtained for the calculation of the… CONTINUE READING