Abstract: A reflector for a lighting fixture that provides a uniform level of lighting. The reflector has a first arcuate portion having a first upper surface and a second arcuate portion having a second upper surface. A first aperture in the first arcuate portion is adapted to receive a first lamp. A second aperture in the second arcuate portion is adapted to receive a second lamp. First and second mounting members on the first and second upper surfaces are adapted to be connected to a lighting fixture housing.

Abstract: A lighting fixture that is adjustable to allow the emitted light to be aimed and focused to suit the application. The adjustable lighting fixture has a housing having an inner surface. First and second mounting arms extend from the inner surface. A reflector has upper and lower surfaces. First and second mounting members extend from the upper surface and are connected to the first and second mounting arms. A first aperture in the reflector receives a first lamp. The first lamp is movable along a first longitudinal axis through the first aperture to focus the emitted light.

Abstract: An analyzer suitable for performing continuous gas analysis in ultra-high purity applications. The analyzer combines a low-level emission source and a gaseous emission spectrometer having a charge coupled device (CCD) diode array as a detector. The CCD detector replaces one or more photomultipliers and narrow bandpass filters typically used in spectrometers. The analyzer performs various processing operations to evaluate and eliminate the effect of background light level, or dark spectrum.

Abstract: An analyzer suitable for performing continuous gas analysis in ultra-high purity applications. The analyzer combines a low-level emission source and a gaseous emission spectrometer having a charge coupled device (CCD) diode array as a detector. The CCD detector replaces one or more photomultipliers and narrow bandpass filters typically used in spectrometers. The analyzer performs various processing operations to evaluate and eliminate the effect of background light level, or dark spectrum.

Abstract: An emergency lighting unit comprises a housing which contains the lighting unit circuitry. The housing includes a wall which defines at least one substantially circular opening therein. Extending partially through this opening is a substantially spherical lighting head containing a light source, such as a halogen lamp. The lighting head is rotatable by hand to any desired rotation to vary the field of illumination.

Abstract: An emergency lighting fixture comprises a housing which contains the lighting head with a light source such as a halogen lamp. The housing is positionable on its backplate in at least four different positions by use of mating slots and indexing members. The indexing members are mounted on extension members cantilevered from edges of the backplate. At least two screws are threadingly received in the extension members and engage the housing adjacent the slots to hold the housing and backplate in assembly.

Abstract: An electric discharge tube for a gas emission spectrometer and method for analyzing and measuring low concentration levels of multiple gas/vapor impurities in a gas stream under continuous flow conditions. The electric discharge tube comprises a plurality of analytical sites through which emissive radiation generated by an alternating source of power across the tube can be analyzed and measured.

Abstract: An emergency lighting unit comprises a housing which contains the lighting unit circuitry. The housing includes a wall which defines at least one substantially circular opening therein. Extending partially through this opening is a substantially spherical lighting head containing a light source, such as a halogen lamp. The lighting head is rotatable by hand to any desired rotation to vary the field of illumination.

Abstract: An illuminated exit sign having at least one chevron-shaped opening on its outer surface and a replaceable directional arrow cover that is substantially similar in shape to the opening and removable from the opening in order to selectively indicate an exit direction. A shoulder which is formed in the cover is adapted to abut with a shoulder formed at the opening. At least two snap tabs located on opposite sides of the arrow cover fit securely within corresponding notches disposed in the shoulder formed at the opening. The opposing configuration of the shoulders and the corresponding configuration of the snap tabs and notches facilitate the removal and replacement of the arrow by a single, quick snapping action which secures the cover in a snug, flush fit.