Abstract: Method and apparatus for determining true cigarette filter rod pressure drop, especially of nonwrapped and soft wrapped filter rods when the circumference thereof is being compressed by an encapsulation method as by an elastic sleeve, the pressure drop and circumference of the elastic sleeve and the filter rod encapsulated therewithin being measured simultaneously, and then through a fifth power relation true pressure drop is determined.

Abstract: Device for attachment to gauging instruments such as optical measuring apparatus, which measure dimensional parameters of articles by scanning the surface or main profile of the article with a light beam as from a laser, the device employing a leaf spring assembly for bearing against and conforming to a portion of the surface of the article; the leaf spring assembly thereby forming a substitute profile over the main profile of the article or of a transparent article, and suppressing any surface anomalies projecting from the article surface, thus providing a reference surface which may be measured by such gauging instruments as representative of the dimensional parameter of the main profile of the article.