Testing of cigarette filters

Claim 1

APPARATUS FOR TESTING THE EFFICIENCY OF A CIGARETTE FILTER COMPRISING: A PNEUMATIC SYSTEM HAVING A LONGITUDINAL PASSAGE; A REMOVABLE FILTER HOLDER RELEASABLY COUPLED WITH THE PNEUMATIC SYSTEM AND HAVING MEANS FOR RELEASABLY HOLDING A CYLINDRICAL FILTER WITH ITS AXIS IN COAXIAL RELATIONSHIP WITH RESPECT TO THE LONGITUDINAL PASSAGE; THE PNEUMATIC SYSTEM HAVING TRANSPARENT TUBE SECTIONS ON EACH SIDE OF SAID FILTER HOLDER; CIGARETTE PUFFING MEANS FOR SMOKING A CIGARETTE HAVING MEANS FOR RELEASABLY MOUNTING THE CIGARETTE AND HAVING FURTHER MEANS FOR INTERMITTENTLY PASSING CIGARETTE SMOKE TO SIMULATE A PUFFING EFFECT THROUGH THE FILTER BY WAY OF THE PNEUMATIC SYSTEM AND SAID TRANSPARENT TUBE SECTIONS; PHOTOMETRIC MEANS FOR MEASURING THE CHANGE IN TKHE CIGARETT SMOKE DESITY BEFORE AND AFTER IT PASSES THE CIGARETTE FILTER; SAID PHOTOMETRIC MEANS HAVING A FIRST LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH ONE OF THE TRANSPARENT TUBE SECTIONS AND A SECOND LIGHT RESPONSIVE MEANS FOR MEASURING THE DENSITY OF THE SMOKE VIEWED THROUGH THE OTHER TRANSPARENT SECTION RESPECTIVELY BEFORE AND AFTER THE SMOKE PASSES THROUGH THE FILTER.