Abstract
Three instruments usually employed for the determination of the diameter of cigarettes, i.e. a nonius instrument, a pneumatic instrument, and a circumference projector, are compared with an optical device developed in the author's laboratory. The latter enables the mean diameter of a cigarette to be determined over a length of 10 mm with an accuracy of AA± 0.0015 mm. With regard to cigarette manufacture, the differences of the results obtained for both cigarettes and filter rods by application of the optical device, of the nonius instrument, and of the pneumatic instrument, respectively, were found to be negligible. The diameter values obtained by means of the projecting apparatus were, however, shown to be too small by one paper thickness.