Abstract: A roll for hot fusing having a coating comprising a cross-linked elastomeric random copolymer of dimethylsiloxane and diphenylsiloxane and three additives, (1) from 40 to 55% by weight of small zinc oxide particles, (2) from 5 to 10% by weight of small graphite particles and (3) from 1 to 5% by weight of ceric dioxide particles.

Abstract: A circuit for the suppression of spurious frequency components for use in cascaded class C common base transistor amplifiers. The circuit uses a capacitor and shunt diode connected in series between emitter and ground of each stage to slow the pulse falltime and thereby eliminate spurious frequencies resulting from parasitic-caused ringing. The cathode-to-capacitor junction is pulsed through an RF choke at the pulse repetition frequency by a pulse generator. This effectively replaces the fast trailing edge of the RF pulse with the slower turn-on time of the PIN diode circuit. The resulting slower falltime eliminates spurious frequency production that normally occurs at each stage of cascaded amplifiers.

Abstract: A new high quality, low cost, thin-film magnetic recording member is provided, which has a coercive field strength greater than 650 Oe, a saturation magnetization greater than 10,000 Gauss, and a squareness ratio of 0.9 or larger. The member includes a substrate on which is directly sputter deposited a chromium layer, without the use of an intervening nickel-containing layer between the substrate and the chromium. A nickel-cobalt recording layer is then sputter deposited directly onto the chromium layer. In the preferred mode, the start of that nickel-cobalt deposition begins less than 100 seconds after the chromium deposition is terminated and is followed by the sputtering of a protective layer. Before the chromium deposition, the substrate is preheatead to drive off adsorbed gases, and to establish the proper conditions for the chromium deposition. The substrate is also heated during the time between when the chromium deposition ends and the nickel-cobalt deposition begins.

Abstract: A spectroscopic method of sensing the presence of methane in an atmosphere includes directing through the atmosphere light emitted by a neodymium laser at a wavelength having a fluorescence linewidth which embraces at least one significant absorption line of the v.sub.2 +2v.sub.2 band of methane.

Abstract: The prevention of electrode material erosion by undercutting in the outer electrode shell of igniter electrodes of jet engine ignition systems is prevented by the application of an electrical insulation coating. The coating is applied to the surface of the outer electrode shell which faces the ceramic insulation around the center electrode where erosion patterns are known to occur. The insulation material is selected from electrical insulation substances such as oxides of aluminum, tungsten, magnesium, beryllium or zirconium by choosing a non-porous electrical insulating substance with thermal expansion characteristics approximately equalling those of the outer electrode shell. Since a typical outer electrode shell is composed of 446 stainless steel, an optimum choice for the electrical insulation coating is AL.sub.2 O.sup.3 deposited with a coating thickness of between 5 and 10 mils.

Abstract: A magnetic head/slider assembly for flying a magnetic head on a fluid bearing relative to magnetic recording media moving in a predetermined direction, as a fluid bearing surface which is convexly curved longitudinally of the assembly. A magnetic recording head extends rearwardly of the slider body with at least a portion of its bottom surface also being convexly curved. The head/slider assembly is supported such that the portion of the assembly closest to the magnetic recording media when the media is stopped is a portion of the slider body forward of the trailing edge thereof, whereby the magnetic head gap remains spaced above the media when the media contacting portion of the assembly is resting thereupon.

Abstract: A method is described for improving the air flow over the surfaces of magnetic recording discs in a disc drive having a plurality of rotatingly driven such discs each having adiameter of less than nine inches and being coaxial and spaced from one another, and such disc drive having a plurality of selectively positionable magnetic transducer heads overlying portions of the discs, the method including spacing adjacent such discs a predetermined minimum distance from one another.

Abstract: A removable instrumentation probe comprising a hollow member, preferably generally cylindrical, which extends through an opening in a wall. The member includes a band which projects outwardly from the member and is comprised of a plurality of circumferentially spaced apart tapered or curved segments which engage the interior of the wall opening to facilitate assembly and removal of the probe.

Abstract: An improved instrumentation probe is disclosed for use within a turbomachine, including an airfoil, such as of a vane, having a portion of its airfoil leading edge removed. The probe is disposed adjacent to the airfoil to replace the removed airfoil leading edge portion and to aerodynamically form the leading edge of the airfoil.