Abstract: Techniques are disclosed for improving the tribology between an air bearing surface of a magnetic recording head and a magnetic recording medium. In addition, techniques are described for reducing resistance to wear and corrosion of the air bearing surface of the recording head as well as resistance to corrosion of the recording medium. Various ion beam techniques can be used to enhance the properties of the recording head and recording medium, and include ion implant techniques, ion mixing techniques and ion burnishing techniques.

Abstract: Techniques are disclosed for improving the tribology between an air bearing surface of a magnetic recording head and a magnetic recording medium. In addition, techniques are described for reducing resistance to wear and corrosion of the air bearing surface of the recording head as well as resistance to corrosion of the recording medium. Various ion beam techniques can be used to enhance the properties of the recording head and recording medium, and include ion implant techniques, ion mixing techniques and ion burnishing techniques.

Abstract: A device for measuring the moisture content of an absorbent material, for example the paper insulation in an electrical transformer, uses a back scattered radiation technique to determine the absorption of light at specific wavelengths. A ratio of the back scattered radiation at different wavelengths can be compared against known values corresponding to a specific moisture content. An optical waveguide such as a bifurcated optical fibre is provided with a probe end optically coupled to a source end and a detection end, for transmitting light to the absorbent material and transmitting back scattered radiation to a detector.

Abstract: A method and device for indicating the swelling of a casing or the like having a wall with at least one generally planar portion prone to deformation by pressure buildup within the casing. The device comprises an elongate strip of visible frangible material adapted for spanning superposition with the planar portion of the wall and means for securing opposing ends of the frangible strip to the casing to restrict movement of the ends perpendicular to the planar portion of the wall. Increasing bulging of the wall deflects the frangible strip to the point of fracture thereof. In another embodiment, gaskets may be interposed between the ends of the frangible strip and the wall of the casing to provide a clearance therebetween, thus increasing the permissible degree of bulging of the wall which may occur before deflection of the frangible strip.

Abstract: A system is provided for the sensing of documents, which system includes an arrangement of reflective elements capable of directing illumination onto the object to be sensed in such a manner that the flux density of the illumination is greater adjacent to the boundaries of said object than in the middle portion thereof. This compensates for the vignetting effect found in lenses. A source of illumination is positioned on a first focal line of a cylindrical elliptical mirror, with the object to be illuminated being positioned at the second focal line. First additional mirrors forming end pieces for the elliptical mirror, and second additional mirrors located adjacent to the boundaries of the object to be sensed, cooperate to direct light from the source to the object in such a way as to achieve the desired distribution of illumination across the object. Several different embodiments of the cylindrical elliptical mirror are disclosed.