Measurements are described of the frictional torque required to make a flat-ended rubber cylinder, bonded at one end to a flat metal plate, rotate about the cylinder axis when the other end is pressed against a flat Plexiglas surface. The contact pressure is found to increase on rotation, by an amount proportional to the square of the torsional deformation of the cylinder. The frictional torque then tends toward extremely large values (seizure) when the imposed compression approaches a critical level of about 20 percent, as predicted by theory. The rubber cylinder then transforms to a nonuniform state of deformation in which parts of the curved surfaces are drawn into contact with the Plexiglas surface. Sliding continues in this torsionally buckled state, at relatively low pressures and torques.

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