<div class="htmlview paragraph">PRESENTED here is a general picture of the mechanical function of crude rubber when combined with metals for the purpose of torsional vibration control.</div> <div class="htmlview paragraph">Dampers of this type have been successfully designed and produced for engines of various displacements up to 650 hp. The author believes that in the future it will be possible to design bonded rubber dampers for engines of greater power output. The characteristics and test data included will show what result can be obtained with the addition of this type of damper.</div>