Abstract: An improved metal-halide arc discharge lamp includes an arc tube having a substantially cylindrical body surrounded laterally by a substantially cylindrical heat-conserving sleeve within an evacuated outer envelope. The ratio of the outer radius of the arc tube divided by the inner radius of the sleeve falls within an optimum range of approximately 0.54 to approximately 0.68, and preferably within a range of approximately 0.60 to approximately 0.63. A lamp constructed in accordance with the invention exhibits improved luminous efficacy and color rendering in comparison to prior art counterparts. The improved performance is believed to be attributable to the more nearly isothermal operation of the arc tube for a given wall loading.

Abstract: A tungsten-halogen lamp for use in an automobile headlight comprises a tubular sealed glass capsule containing two coiled tungsten filaments for high and low beam operation, respectively. The low beam filament is disposed substantially orthogonal to a vertical plane containing the lamp axis, with the center of that filament length having a predetermined offset from that vertical plane and being disposed at or near the focal point of the reflector. The high beam filament is disposed substantially parallel to the lamp axis on the opposite side of the vertical plane from at least a major portion of the low beam filament. The filaments are spaced apart with the high beam filament lying in a horizontal plane spaced below the low beam filament, and the axis of the high beam filament orthogonally intersects a plane containing in the axis of the low beam filament.

Abstract: A pair of matched, serrated cams can be used as an adjustable shim to fill the gap between two fixed abutments. The overall length of the shim is externally adjustable after installation. Each matching cam may have more than one ramp surface, depending upon the conditions of restraint of the shims in a particular application.

Abstract: A rotary vane type air lock for feeding granular abrasive materials into a pressurized chamber having means to prevent the abrasive material from coming between ends of the vanes and the air lock housing. A baffle prevents impingement of the material on the vane ends just before they reach an edge of the inlet opening. A thin sheet of high velocity air directed across the vane ends blasts off any material clinging to the end before the vane end comes into pressure sealing relationship with the housing.

Abstract: A circuit for starting and operating an arc lamp includes a full wave rectifier having an input connected to a source of alternating current line voltage and a pair of output terminals having a filter capacitor connected thereacross for providing a source of direct current voltage. Connected to one of the direct current terminals is a resonant charging circuit comprising a controlled rectifier switch, an inductor and a capacitor serially connected in a circuit loop. Another inductor, which may comprise the secondary winding of a starting pulse transformer, is connected between the output of the resonant circuit and one of the supply terminals for the arc lamp to provide the dual function of both averaging filter and lamp ballast. The reference terminal of the direct current source is connected to the other arc lamp supply terminal and through a back swing diode to the output of the resonant circuit.

Abstract: A conveyor roller wheel assembly comprising a roller member rotatably mounted on a hub member, as by means of a plain journal bearing or by rolling elements such as ball or roller bearings, between inner and outer seal flanges on the hub member, the hub member having a portion of reduced diameter between its ends and a lubrication passageway extending from an end face of the hub member and communicating with its reduced diameter portion through a surface thereof. Facing side surfaces of the roller member and seal flanges are shaped to define annular labyrinth seal passageways therearound of restricted cross section and of tortuous configuration radially of the conveyor wheel. One or more of the wheel assembly members may be constituted of moldings of sintered powered metal.

Abstract: An intrusion alarm system and method is provided which includes one or more sound pulse transmitters that are triggered upon the opening of an entryway, such as a door or window, to produce a high-intensity sound pulse having a decibel level above a predetermined minimum. For example, each transmitter may comprise a percussive photoflash unit in combination with a pyrotechnic device which responds to the radiant output of the fired photoflash unit to emit the intense sound pulse. A centralized detector responds to the sound pulse above a predetermined threshold level to produce an alarm signal. Preferably, the detector comprises an electroacoustical transducer arrangement which provides the dual functions of both sound pulse detection and generation of an audible alarm.

Abstract: An electrically fired flash lamp which utilizes a single conductive lead member. The lead protrudes within the lamp's envelope and is covered by a quantity of primer material. A conductive coating (e.g. tin oxide) covers a major portion of the external surface of the envelope and is capacitively coupled through the envelope's wall to the combustible filamentary material (e.g. shredded zirconium) therein. In another embodiment, a second conductive coating is located on the internal surface of the envelope opposite the outer coating and in electrical contact with the filamentary material. Accordingly, both coatings are capacitively coupled when the lamp is electrically fired. A sequentially-activated array of the above lamps is also disclosed.

Abstract: An intrusion alarm circuit including a single electroacoustical transducer, such as a diaphragm-supported piezoelectric element, connected to an amplifier in a positive feedback loop configuration. The transducer functions as both a sound pickup and sound generator. When the ambient sound level exceeds a preselected threshold level, the resulting vibration of the transducer generates a voltage which activates the amplifier, whereupon the transducer vibrations are sustained and amplified in the manner of an oscillator, thereby producing an audible alarm.

Abstract: Several means are described for providing an electrical coupling path through a protective, insulative layer, e.g. cellulose acetate, located on an electrically activated flash lamp envelope. The function of the path is to interconnect a thin conductive coating positioned on the envelope's external surface under the insulative layer with an electrical contact located externally of the flash lamp and adapted for igniting the lamp.

Abstract: A seal for rotary pumps, engines, and the like, comprises roller means with variable effective length held in a variable-length supportive body or holder; extension cams maintain longitudinal tolerance of the roller means despite mechanical wear, machining imperfections and thermal expansion and contraction; wedge means maintain longitudinal tolerance of the holder. The seal is effective both at apex and corner areas of the rotary apparatus.

Abstract: A circuit for operating an arc discharge flash lamp that is directly coupled across an alternating current (AC) source. The lamp is ignited by a high voltage pulse generated by a trigger circuit energized by the AC source. A voltage multiplier, such as a doubler circuit, is connected across the flash lamp for increasing the voltage across the lamp above that provided by the AC source, thereby facilitating starting of the lamp by the trigger circuit.

Abstract: A circuit arrangement for triggering an arc discharge flash lamp that is directly coupled through series circuitry across an alternating current (AC) source. The lamp is ignited by a high voltage pulse generated from a pulse transformer in response to discharge of a voltage doubler charging capacitor by a controlled switch trigger from an RC timing circuit at a predetermined phase of the alternating current power source. Circuit operation is initiated by a switching arrangement which is coupled to the timing circuit through a zero crossing detector and shunt switch for assuring that the timing circuit starts at a predetermined point on the alternating current waveform. In this manner, the lamp reliably flashes with the same intensity each time a flash is requested.

Abstract: A seal for rotary pumps, engines, and the like, comprises roller means with variable effective length held in a variable-length supportive body or holder; extension cams maintain longitudinal tolerance of the roller means despite mechanical wear, machining imperfections and thermal expansion and contraction; wedge means maintain longitudinal tolerance of the holder. The seal is effective both at apex and corner areas of the rotary apparatus.

Abstract: The arc tube of an electric discharge lamp is surrounded by a reflective filter. The filter selectively reflects arc discharge radiation outside the visible range to which the arc tube wall is transparent and to which the arc plasma is optically thick, so that the reflected radiation is preferentially absorbed by the plasma and not by the arc tube wall.