Abstract: A multiple photoflash lamp array is disclosed capable of producing a plurality of flashes for taking a plurality of flash pictures. The particular lamp construction includes a reflective unit having a plurality of adjacent reflectors or reflector cavities, each having a photoflash lamp mounted therein on a common base having a rigid molded plastic cover or shield which is light transmitting secured to said base and holding the entire assembly together. A butadiene styrene polymer is employed as the material of construction for said light transmitting cover means to provide better protection against shattering when the lamps are flashed than is obtained with the styrene homopolymer material now being used.

Abstract: Use of terbium-activated rare earth oxyhalide phosphor material in a high-loaded fluorescent lamp having an operating temperature range of approximately 100.degree. C or greater provides high efficiency emission. The phosphor material can be utilized alone or in combination with other suitable phosphor materials at the elevated operating temperatures to generate white-light composite emission. For white-light emission, the phosphor admixture further includes a narrow band red-emitting phosphor along with a narrow band blue-emitting phosphor in suitable portions.

Abstract: A CaO containing silicate glass composition which can further contain small amounts of lead oxide and barium oxide is generally useful for hermetically sealing the electrical in-leads of various electrical devices. The present glass has a composition range in percentages by weight of:______________________________________ Constituents Weight Percent ______________________________________ SiO.sub.2 65-75 Na.sub.2 O 9-13 K.sub.2 O 3-6 Al.sub.2 O.sub.3 1-4 CaO 4-8 BaO 0-4 PbO 0-6 Li.sub.2 O 0-2 ______________________________________along with minor amounts of incidental impurities, residual fluxes and refining agents.

Abstract: The performance characteristics of (Ba,Sr)F, (Cl,Br) : Eu.sup.+2 phosphors may be improved by combining these phosphors with particular rare earth oxyhalide phosphors. In the preferred embodiments, the latter phosphors have relatively small and well-formed crystalline particles which become interspersed with the larger crystalline particles of the (Ba,Sr)F, (Cl,Br) : Eu.sup.+2 phosphor.

Abstract: An improved static solid switching device is disclosed for activation by radiant energy when a flash lamp located adjacent thereto is flashed. The multiple flash lamp array having a plurality of lamps fired individually and in sequence for use with said improved static solid switching devices is further disclosed. The switches are prepared from compositions which include the presence of a non-conductive particulate solid to provide improvement in switch manufacture as well as switch operation.

Abstract: 1. The method of acquiring a target with a torpedo comprising the steps of launching the torpedo into a target area, causing the torpedo to descend in a substantially vertical direction, actuating acoustic transducer means in order to detect the presence of a target while the torpedo is descending in said substantial vertical direction, and initiating an attack mode upon acquiring a target.

Abstract: A fluorescent lamp construction is described utilizing a particular combination of two different phosphor materials in order to produce an efficient composite emission. The particular phosphor combination can be utilized as a blended mixture in order to provide efficient white light with color rendition comparable to deluxe-type fluorescent lamps.

Abstract: Increased optical transmission is provided for a body of light transmissive polycrystalline alumina body treated at elevated temperatures with a molten flux composition. A tube of the flux polished material which can be used as the light transmissive envelope for high intensity discharge lamps especially sodium vapor lamps, improves light output from the lamp as the result of increased in-line transmission for the treated envelope member. A method of chemically polishing polycrystalline alumina material in this manner is also disclosed.

Abstract: An improved wire anvil member for a percussion ignitable type flash lamp is described having projection means to deflect hot primer particles upon ignition but which has openings permitting some of the hot primer particles to pass through for improved ignition of the principal combustible material contained in the lamp envelope. The present wire anvil can also be die-cast as an integral member utilizing commercially available zinc alloy materials.

Abstract: An improved mercury vapor lamp construction as described which includes an ultraviolet reflecting underlayer of alumina particles for the phosphor coating to enable reduction in the phosphor coating weight without accompanying reduction in the lamp lumen output. The alumina underlayer comprises spherical alumina particles that have been vapor-deposited in a certain particle size range to provide selective reflection of the ultraviolet radiation being emitted from the overlying phosphor coating. The alumina underlayer is deposited upon the interior surface of the lamp glass envelope and has been found generally useful in otherwise conventional high-pressure and low-pressure mercury vapor lamps.

Abstract: An improved rectangular shaped pressed glass sealed beam lamp unit is provided which includes a molded projection disposed at a particular location on the lens and reflector members to provide more reliable hermetic sealing when joined together at their peripheries. Specifically, the molded projections are provided on the back sealing surfaces of each rim region to reduce unwanted deformation which otherwise occurs when these members are initially formed by pressing the glass in molds. Said molded projections disappear for the most part during the aforesaid heat sealing assembly although the glass material remains in the rim region after joinder.

Abstract: An improved cool-white fluorescent lamp utilizes a particular two-component phosphor combination exhibiting a narrow "blue" emission spectrum and a broad "yellow" emission spectrum to achieve improved luminous efficacy. In one preferred embodiment, the combination is a blended mixture of europium activated strontium chlorapatite with manganese and antimony coactivated calcium fluorapatite phosphors.

Abstract: Oxyhalides of lanthanum and/or gadolinium coactivated with thulium and terbium are phosphors found to have the advantages of reduced afterglow and increased ultraviolet emisson. The relative speed of the phosphors is also quite high. These phosphors are used in x-ray image converters generally, and can be used in such devices as x-ray image intensifier tubes, in fluoroscopic screens and in radiographic intensifier screens.

Abstract: Oxybromides of lanthanum and gadolinium activated with bismuth are found to be superior in their conversion efficiency of X-rays to visible light when compared with conventional X-ray phosphors. The incorporation of the ytterbium ion in these phosphor materials produces reduced afterglow when used in X-ray image converter devices such as X-ray image intensifier tubes, fluoroscopic screens, and radiographic screens.

Abstract: Aluminosilicate glasses containing BaO and CaO are provided having combined high softening points along with exceptionally low liquidus temperatures. These glasses are within the following compositional limits in percent by weight:______________________________________ Percentage Oxides Range ______________________________________ SiO.sub.2 55-68 Al.sub.2 O.sub.3 15-18 CaO 7-13 BaO 6-16 ______________________________________except for incidental impurities, residual fluxes and refining agents. The weight ratio of Al.sub.2 O.sub.3 to combined weight ratio of CaO and BaO in the present glass composition is maintained in the range 0.6:1 to 1:1. Such glasses provide an improved hermetic seal for high temperature lamp envelopes.

Abstract: This invention relates to a method for preparation of a stereo isomer mixture of crystalline alpha-cyanoethylphthalate wherein the stereo isomer mixture is separated from the reaction mixture by precipitation. More particularly, the stereo isomer mixture is initially formed by reacting lactonitrile and a phthalic acid halide in an organic liquid solution at ambient conditions and the stereo isomer mixture precipitated therefrom by adding an organic precipitant liquid to the reaction mixture. By-products and side-reaction products can be washed from the reaction mixture prior to precipitation of the stereo isomer mixture to provide an alpha-cyanoethylphthalate product having greater purity than conventionally obtained. Additionally, the present alpha-cyanoethylphthalate composition can be characterized as a mixture of the meso and dl isomers wherein one isomer has a predominant weight ratio in the mixture.

Abstract: A novel class of soluble organic nitrogen compounds which produces various colors when dissolved in organic liquid solvents. These dyes produce a color from blue to red if the organic liquid medium has a neutral or basic pH which reversibly changes to yellow if the liquid medium has an acid pH. The color variation can also serve as an indication of solvent polarity.

Abstract: A light diffusion coating for an electric lamp is described which comprises a thin layer of spherical alumina particles that have been vapor-deposited in a certain particle size range to provide more effective light scattering. The coatings are deposited upon the interior surface of the sealed glass envelope and have been found especially useful for incandescent lamps as well as for such other lamps as electric discharge lamps.

Abstract: Increased optical transmission is provided for a body of light transmissive polycrystalline alumina body treated at elevated temperatures with a molten flux composition. A tube of the flux polished material which can be used as the light transmissive envelope for high intensity discharge lamps especially sodium vapor lamps, improves light output from the lamp as the result of increased in-line transmission for the treated envelope member. A method of chemically polishing polycrystalline alumina material in this manner is also disclosed.

Abstract: Color correction is provided in a high-pressure mercury vapor discharge lamp with a particular combination of two different phosphor materials producing an efficient composite emission. A blend of said phospor materials can improve color rendition without effecting any significant reduction in the lamp lumen output.