Abstract: A gaseous fluid purifier comprising at least two disks having a common axis of symmetry or of rotation and spaced apart from each other; the disks are comprised of a roughened material adapted to adsorb impurities from the fluid being purified; the disks may be additionally impregnated with neutralizing, or the like, chemical substance; at least one of the disks is of conical shape; in some embodiments, the distance between the two disks at the peripheries of the disks is smaller than the distance between them at the center; a central aspiration opening of circular shape is provided in at least one of the two disks; rotation of at least one, and more usually both, of the two disks aspirates fluid to be purified through the aspiration opening and between the disks and the purified fluid exits radially from between the disks; in other embodiments, the disks are not conically shaped, but the disk surfaces are shaped to produce discontinuities in the fluid flow.

Abstract: A crane cable attachment for delivering and taking up loads through openings in walls and the like comprises a generally horizontal rail suspended from the crane cable. A load carrying carriage is mounted for movement along the rail, between a lifting position underneath the cable and a loading and unloading position towards one end of the rail. An elongate prop is pivotally connected to this end of the rail for movement between a position in which it may rest on the ground where a load is to be delivered or taken up and a lifting position folded under the rail. A counter-weight is provided at the other end of the rail to maintain it horizontal when both the prop and carriage are in the lifting positions.