Abstract: A system and method for conformal alignment of an aircraft-based head worn display (HWD) system defines far-field features in view of the HWD display, each far-field feature having a 3D truth position in a navigational reference frame. The aircraft GPS/IRS determines pointing vectors to each feature in the aircraft reference frame. The HWD user estimates a nominal head pose for orienting the far-field features in the HWD display, and the HWD system renders the far-field features based on the nominal head pose and pointing vectors. The rendered far-field features are aligned to their real-world 3D truth positions (either manually or with the assistance of witness cameras) and a latched pose of the HWD headtracker system determined based on a successful alignment within accuracy bounds. Based on the latched headtracker pose, the HWD headtracker alignment and the alignment of the HWD display reference frame to the aircraft reference frame are updated.

Abstract: A method of providing a mixture of lean and rich gas of a desired composition by means of a jet compressor system comprising two or more jet compressors comprising:(1) adjusting the jet compressor system being used to mix the lean and rich gas to provide a leaner gas mixture than the desired composition;(2) then adding a predetermined amount of rich gas to the leaner gas mixture to attempt to obtain the desired composition; and(3) varying the amount of rich gas added to the leaner gas in response to the measurement of gas properties in the jet compressor system to thereby more nearly obtain a gas of the desired composition. Preferably the lean gas comprises air, blast furnace gas, or BOF gas, and the rich gas comprises methane, natural gas, propane, or butane.

Abstract: A method of surface conditioning a stainless steel to remove oxides and imperfections therefrom whereby the steel is heated in a controlled atmosphere having an oxygen potential, (log P.sub.O.sbsb.2) between (-29,280/T) + 5.6 and (-27,840/T) + 8.1 where T is the absolute temperature in degrees Kelvin.

Abstract: A coating composition containing 75-95% MgO, 2-10% B.sub.2 O.sub.3 and 0-15% C, which is effective in retarding oxidation of ferrous metal articles, especially at temperatures in excess of 2150.degree.F. Additional protection is achieved when about 11-17% TiO.sub.2 is substituted for about the same amount of MgO. The composition is admixed with a suitable vehicle and is applied to the metal surface in the form of a dispersion, suspension or as a slurry.