the conical depression in the friction pin and the concave surfaces of the inner wheel member 4 a very slight clearance being maintained between the outer end of the friction pin 6 and the outer wheel member 5 in use the present device is attached to a structure such as the wall of a building by means of one of the handles 1b or 2a the other handle being connected to a section of pipe or other structural member whose motion relative to a stationary building structure is to be damped when a relatively slow frictional movement is caused to occur between the primary housing 1 and the auxiliary housing 2 such as by a relatively slow displacement of the section of pipe to which the present device is connected the rod 3 will be caused to rotate as each friction pin 6 is pressed toward the inner wheel member 4 by each of the springs 7 the outer wheel member 5 will correspondingly rotate integrally with the inner wheel member 4 at a sufficiently slow angular rate so as not to displace the section of piping in a situation where the section of piping to which the present device is attached is caused to quickly vibrate the rod 3 is caused to move in a rapid reciprocating manner and thus causes the inner wheel member 4 to be rapidly rotated due to inertia however if the outer wheel member 5 will not fully follow the rotation of the inner wheel member 4 a slip thus occurs between the rotations of said members accordingly each of the ball members 8 are caused to roll.