Abstract: The pocket filter exhibits an outer frame made of plastics material and several adjacent filter elements arranged in the outer frame. The outer frame is composed of opposing limb profiles, a base profile and a closing profile which each have an essentially U-shaped cross section with an inwardly opened interior space. The profiles can be joined to one another at the corners of the outer frame by corner connectors. An inner frame made of plastics material is arranged inside a free border of each filter pocket. Each inner frame has opposing longitudinal profiles and facing profiles fastened thereon. Each longitudinal profile has holes spaced from one another and projecting parts which extend outward and which cooperate in the open outer frame when the filter elements are pushed in. Transverse walls fastened on the accompanying longitudinal profile extend into an inlet of the inner frame.

Abstract: The diameters of successive rod-shaped articles of the tobacco processing industry are ascertained while the articles advance sideways at the periphery of a rotary drum-shaped conveyor and are rotated about their longitudinal axes as a result of frictional engagement with a rolling member which is adjacent the periphery of the conveyor. Successive articles which are being rotated by the rolling member are caused to interrupt a beam of radiation issuing from a laser, either once or more than once, and the amounts of intercepted radiation are indicative of the diameters of the respective articles. Such amounts of intercepted radiation are monitored by a video camera which generates electric signals, and the electric signals are processed into second signals denoting the diameters of discrete successively tested articles and/or the average diameters of series of two or more successively tested articles.