Abstract: Apparatus and a method for analyzing the refractive index profile of a cylindrical, transparent optical waveguide preform, utilizing a scanning light beam to traverse a fixed preform and a refractor to direct light deflected by the preform onto a displacement sensor, is described.

Abstract: A method for spray-decorating a low-expansion glass, glass-ceramic or ceramic article having an expansion coefficient in the range of about 0-35.times.10.sup.-7 /.degree.C. with a relatively high expansion fritted ceramic enameling composition having an expansion coefficient in the range of about 45-75.times.10.sup.-7 /.degree.C. wherein good surface coverage and color uniformity in combination with acceptable spall resistance in the applied enamel are provided by applying the enameling composition as a very thin film in the form of a non-aqueous oil-based spraying suspension.

Abstract: A continuous method for making mica film by electrophoresis wherein mica is deposited on an endless moving electrode surface from a mica sol, removed from the sol, dried, and finally stripped from the electrode, and apparatus for use in practicing the method, are described.

Abstract: Compositions in the NbF.sub.5 (TaF.sub.5)-P.sub.2 O.sub.5 system which are liquid at room temperature and exhibit relatively high ionic conductivities, useful for example, as electrolytes in batteries or other electrochemical cells, are described.

Abstract: Electrochromic devices comprising anodic and/or cathodic electrochromic elements in combination with an ion-permeable polycrystalline mica electrolyte, the electrolyte comprising mica crystals containing exchangeable Na.sup.+, Li.sup.+ and/or H.sup.+ interlayer cations and optionally being provided as a self-supporting, flexible, transparent or opaque electrolyte sheet, are described.

Abstract: Optical patterns formed by localized optical density or refractive index variations in glass are produced by impregnating a porous glass support with a photolyzable organometallic compound and selectively exposing the glass to a photolyzing light source to cause the photolytic decomposition of the organometallic compound in exposed portions of the glass. The patterns are fixed, if desired, by removing unreacted organometallic compound from the pores.