Abstract: An intrinsic safety barrier for use in combination with electromagnetic transducers which are intended to generate alternating current signals in hazardous zones and to transmit such alternating signals out of the hazardous zone to remote signal-responsive installations. The intrinsic safety barrier permits transmission of alternating current signals without significant distortion and yet precludes introduction of surges of electrical energy into the hazardous area.

Abstract: A gaseous stream is freed of its particulate material in apparatus which includes a casing having an inlet opening, an outlet opening, and an impingement screen disposed across the inlet opening and comprising single or multiple, preferably staggered rows of impingement elements of V-shaped transverse profile positioned with the apex thereof facing the inlet opening. As the gaseous stream flows through the impingement screen, vortices are formed at the trailing edge of each element whereby droplets in the gaseous stream are entrained into the vortices, spin into a low pressure region which exists inside the open rear of the impingement element, and drain by gravity to collecting means. A series of radially extending vanes positioned downstream of the impingement screen impart swirl to the gaseous stream. A series of coaxial frustoconical rings are provided downstream of the vanes. Support means maintain the coaxial frustoconical rings in overlapping arrangement.

Abstract: An improved joint seal for a clay tile pipe having bell and spigot configurations is provided with unsaturated polyester resin in a foamed, low density state, preferably below about 50 pounds per cubic foot.

Abstract: Multiple layer light transmissive laminates and a method for making them. Such laminates are particularly adapted for use as glazing materials. The laminates retain light transmissivity after exposure to elevated temperatures. The laminates include two or more layers of light transmissive sheets such as glass, polymerized methylmethacrylate and the like, bonded together by means of a thermosetting resin which is cured in the absence of free oxygen and in the absence of oxygen-generating polymerization initiators. The curing is achieved by means of radiation energy delivered through at least one light-transmissive sheet into the resin.

Abstract: A combination electronic device provides balance analyzing capabilities, narrow band and wide band spectrum analysis capabilities, automatic tracking filtering capabilities, precision dynamic balancing with remote phase presentation, and tracking filtering. The device presents multiple functions including:1. A testing function;2. A balancing function;3. A tracking filter function;4. A filter-out-speed function;5. A filter-out-frequency function;6. Spectrum analysis function.Included within the circuitry are the following components:A. a vibration signal conditioning circuit;B. an active filter having the equivalent of a four-pole response with a two-pole delay;C. a pulse-to-sine and pulse-to-consine reference signal generating circuit;D. a reference pulse conditioning circuit;E. a digital sweep circuit for spectrum analysis;F. switching circuitry to accommodate all six functions;G. adjustment means to accommodate full-scale presentation of data on X-Y recorders.

Abstract: A closure seal member for capping the perimeter recesses presented between a closure and the surrounding fixed frame assembly. The closure seal member includes a longitudinally rigid support member adapted for interlocking engagement with a frame member of the assembly; and a sealing strip carried at the exterior face of the support member, with a portion thereof positioned to be compressed between the angle member and the closure, and a portion thereof exposed to view. The sealing strip has end portions extending beyond the opposite ends of the support member. At the juncture of adjacent, angularly disposed frame members, the sealing strip end portions of adjacent seal members are engaged to provide a neat corner presentation. The overall length of the support member is less than that of the frame member. Field cutting of metal is avoided.

Abstract: An underfloor access housing adapted for use with cellular flooring units of the type normally placed in building floors, and which provide plural cells separated by troughs. The access housing presents a dual outlet opening in its top wall, spans across a trough, and is secured to the crests of adjacent cells. Trough closures positioned on opposite sides of the access housing, enclose a trough space accessible through the dual outlet opening. Cell access openings provided in the webs of the flooring unit establish communication between the cells and the trough space. A partition divides the interiors of the housing and of the trough space into separate compartments, each including one of the cell access openings and one including the dual outlet opening. The partition is adapted to support at least one electrical plug receptacle whereby electrical connections may be made beneath the level of the finished floor.

Abstract: An electrical trench assembly having a base pan and vertically adjustable side rails. Said side rails being secured to and carried by said base pan by means of adjusting screws, which are carried by said rails and which screw into threaded connections on said pan. The cover plate for the trench assembly is attached to the side rails by resilient fasteners.