Manufacture of hollow articles

Claim 1

A TESTING DEVICE FOR TESTING THE WRAPPERS OF WRAPPED RODS HAVING UNWRAPPED ENDS, THE DEVICE INCLUDING SEALING MEANS HAVING PARTS ARRANGED TO ENGAGE THE ROD CLOSELY FORMING A CHAMBER AROUND AT LEAST THE GREATER PART OF THE EXTERIOR OF THE WRAPPER AND SEALING OFF THE EXTERIOR OF THE WRAPPR FROM THE UNWRAPPED ENDS OF THE ROD, SUCTION MEANS TO APPLY SUCTION TO THE SAID CHAMBER, SAID CHAMBER AND SEALING MEANS BEING SO DISPOSED THAT THE ACTION OF THE SUCTION MEANS ESTABLISHES A DIFFERENCE IN AIR PRESSURE BETWEEN THE INTERIOR OF THE ROD AND A SPACE SURROUNDING THE EXTERIOR OF THE WRAPPER, AND THAT ANY AIR FLOW OCCURRING AS A RESULT OF THE ESTABLISHMENT OF SUCH PRESSURE DIFFERENCE IN AN AIR FLOW THROUGH THE WRAPPER INTO SAID CHAMBER, WHEREBY ANY SUCH AIR FLOW BEYOND A PREDETERMINED MINIMUM INDICATES A LEAK IN THE WRAPPER, MEANS TO ENABLE AIR TO ENTER THE ROD THROUGH ONE OF ITS UNWRAPPED ENDS AND CLOSURE MEANS TO CLOSE THE OTHER OF THE UNWRAPPED ENDS OF THE ROD.