Abstract: A flow-through system for determining the particle size distribution of iron oxide particulate matter in a reactor water sample. The system includes a magnetic filter having a chamber through which a stream of reactor water. The chamber is surrounded by a winding which is coupled to an electrical circuit for generating a varying magnetic field which interacts with any magnetic particulates entrained in the water sample flowing through chamber. When a strong magnetic field is established, magnetic particles are filtered out of the water stream flowing through the chamber by magnetic attraction. Therefore, only particles which are non-magnetic or slightly magnetic pass through the magnetic filter. The particles which pass through the magnetic filter then enter a conventional particle distribution analyzer which counts and sizes the particles in the water stream flowing therethrough.

Abstract: A drainage system includes a plurality of water collection pans which may be quickly inserted in the interior cavities of masonry block units over the length of a selected block wall course for collecting the water drained through the interior cavities of the upper courses and directing water to the exterior of the wall. In one embodiment, the collection pans (utilized for units such as bond beam, lintel, or knock-out blocks) includes a collector portion for positioning in the interior cavity of the block and extending across substantially the entire length of the block, the front and rear edges of the collector portion each including a flange extending generally horizontally to contact the top surface of the block, and a drainage channel extending outward from the collector portion past the endwall of the block into the head joint between the block and an adjacent block. Another embodiment of the collection pan designed for use with conventional C.M.U.

Abstract: Keyed column chromatography apparatus comprises a polymer body having a channel extending therethrough, means for coupling the column to insertion apparatus having complimentary coupling means, and keying means on the outer surface of the column. In addition, a collecting tube comprises a hollow body having one end having an aperture therethrough and having keying means on the outer surface of the tube. Further, a rack for receiving generally cylindrical bodies having complimentary keying means comprises a top surface and a plurality of legs sufficient to support the top surface. The kit comprising and facilitating the same method is included.

Abstract: A self-contained swab unit comprises a cylindrical plastic tube having a foam rubber swab capping one end. The tube is closed at the opposite end by a heating and crimping process. A cleansing or sterilizing solution is loaded into the tube. The tube is sealed by a plug having a diameter slightly larger than the inside diameter of the cylinder, so that the solution is sealed away from the foam rubber swab when not in use. Squeezing the tube causes the plug to pivot in relation to the wall of the tube so that the seal is broken and liquid may saturate the swab. Releasing the squeeze pressure on the tube causes the plug to pivot back into a partial seal so that the amount of fluid used in swabbing can be controlled.

Abstract: A two-piece telescoping cylinder made of a flexible plastic material forms a disposable container for a swab and a liquid culture medium. The upper piece serves as a handle for the swab and cooperates with the lower piece to form a sealed container for the swab and liquid. A generally conical plug having a base slightly larger than the inside diameter of the cylinder divides the lower piece into two compartments, sealing the liquid from the swab. When the telescoping parts are pushed together, the swab contacts the plug and pivots it in relation to the side walls of the tube so that the seal is broken and the liquid may saturate the swab or a cotton wad immediately above the swab.

Abstract: A changeable-configuration geometric device including four right tetrahedrons hinged together with an equilateral tetrahedron in such a manner that the various tetrahedrons may be swung relative to one another to form an infinite number of different overall configurations for the device. One configuration which is producible is that of an equilateral cube, in which configuration the equilateral tetrahedron forms the central core of the cube.