It has been found possible to use the rotating cylinder viscometer to measure the viscosity of liquid helium II between 1.13°K. and 2.18°K. provided that the fluid velocities do not exceed about 0.08 cm. sec.−1. The results, which are calculated directly from experimental observations and do not require any knowledge of the density of the normal component, can be made to fit the Landau and Khalatnikov theory for the temperatures below 1.8°K. for which the theory is applicable. The results are somewhat higher than the oscillating disk results above 1.4°K.