Calenders to overcome barring

Claim 1

IN A PAPER CALENDERING MACHINE HAVING A STACK OF AT LEAST TWO CALENDERING ROLLS IN VERTICAL SUPERIMPOSED RELATION, MEANS SUPPORTING SAID ROLLS FOR ROTATION AND UP AND DOWN MOVEMENTS, SAID ROLLS FORMING A PLURALITY OF NIPS THERE-BETWEEN THROUGH WHICH A PAPER WEB IS PASSED TO CALENDER IT, SAID WEB HAVING PLASTIC PROPERTIES SO THAT VARIATIONS IN THICKNESS LENGTHWISE THE WEB CAUSED IN ONE OF SAID NIPS ARE FED TO THE NEXT NIP CAUSING FORCE VARIATIONS ON THE ROLLS IN SAID STACK AND CREATING AND MAINTAINING SELF EXCITED VIBRATIONS CHARACTERIZED BY UP AND DOWN MOVEMENT BETWEEN AT LEAST TWO OF THE ROLLS IN SAID STACK AND CONSEQUENT BARRING OF SAID WEB, THE COMBINATION THEREWITH OF MEANS FOR REDUCING SAID SELF EXCITED VIBRATION COMPRISING A LIGHT WEIGHT, SUBSTANTIALLY HOLLOW ROLL ABOVE THE TOP ROLL OF SAID STACK AND FORMING A NIP THEREBETWEEN, MEANS ENGAGING SAID LIGHT WEIGHT ROLL THROUGHOUT SUBSTANTIALLY ITS ENTIRE LENGTH, GAS PRESSURE MEANS OPERATIVELY CONNECTED WITH THE MEANS ENGAGING THE LIGHT WEIGHT ROLL FOR RESILIENTLY BIASING SAID LIGHT WEIGHT ROLL TOWARD SAID TOP ROLL IN SAID STACK TO MAINTAIN A CONSTANT PRESSURE BETWEEN AT LEAST SAID LIGHT WEIGHT ROL AND SAID TOP ROLL TO PRODUCE A COMPRESSED WEB OF LENGTHWISE CONSTANT WEB THICKNESS LEAVING SAID NIP THEREBETWEEN, SAID CONSTANT WEB THICKNESS REDUCING INITIATION AND MAINTENANCE OF SELF EXCITED VIBRATIONS IN SAID STACK AND REDUCING BARRING OF THE PAPER WEB.