Abstract: Trickling sheet (2) comprising in the direction of its first side or base (3) a first zone which is greatly corrugated (5) and a second zone which is slightly corrugated or flat (6), of equal width, these zones being provided with spacer bosses (7) at the two sides of the sheet, the mean plane of the second zone or the plane of the flat zone (6) being offset in such a manner that the tops of the bosses (7) of one of the two faces of the sheet are co-planar. An assembly of such sheets juxtaposed with one another by turning one sheet out of two through 180.degree. about the median line (9) separating the two zones constitutes a packing element with rectilinear channels, without obstacles or awkward recesses or bottlenecks.

Abstract: A furnishing device comprises liquid carrying fill sheets which are juxtaposed and vertically corrugated and define therebetween passages for a gas, said sheets comprising in succession, in a direction parallel to the crests of the corrugations at least two regions in which the corrugations have different amplitudes, namely a region having corrugations of large amplitude and a region having corrugations of small amplitude which are interconnected by a transition region. Each sheet has at intervals along the crests of its corrugations spacer devices by means of which one sheet may be fixed to an adjacent sheet and maintained out of contact with the latter except in the region of the spacer devices.