Abstract: A structure for making a sealed electrical connection through a barrier is disclosed. The structure comprises a feed-through board that is sealed in an aperture in the barrier. A conductive rod is disposed within a bore formed in the board. Inner and outer conductors are electrically connected to the conductive rod by means of connecting structures formed in the respective ends thereof. A plurality of layers of insulative materials are formed about the inner and outer conductors and the conductive rod so as to electrically insulate the conductors and the conductive rod, to form a structurally sound point of connection through the barrier, and to seal the bore through which the conductive rod is passed. A method for making a sealed electrical connection through a barrier is also disclosed.

Abstract: A process is provided for sterilizing or pasturizing aqueous fluids by reducing the pH of a fluid in a first compartment of an electrolytic cell, maintaining the fluid with the reduced pH at a sterilizing temperature for a sufficient time to reduce the concentration of microbial cells in the fluid. The pH sterilized fluid is restored in a second compartment of an electrolytic cell.

Abstract: A process is provided to adjust the acidity of a flowable fluid by the electrodialysis in a cell containing membrane pairs comprising a bipolar membrane and an ion selective membrane.

Abstract: The turn tilt table is preferably mounted on a self propelled mobile vehicle for carrying a test article such as a military vehicle weighing up to 70 tons. The mobile vehicle is driven to a plurality of test sites at which radar beams or the like are directed against the test article for determining vehicle radar signatures or the like. During testing, the turn tilt table may be tilted anywhere between a horizontal position and 45.degree. from the horizontal; and may be pivoted 360.degree. about an axis normal to the plane of the turn tilt table to any of a plurality of positions within 360.degree.. If vehicles are being tested, a ramp is connectable to the table to allow the vehicle to be driven onto or off the table.

Abstract: The multipurpose vehicle of the present invention is designed to operate in and around dry docks and wharfs and its capable of lifting and moving propellers from propeller shafts within areas confined by a ship's rudder and to carry the propeller to an area away from the ship to be lifted to the wharf by crane. The propellers may weigh as much as 75,000 pounds and be 23 feet in diameter. The vehicle may also be used to accurately position keel blocks and haul blocks weighing up to 25,000 pounds in positions to support a ship. The vehicle may be lifted by crane out of dry dock to test padeyes for safety and certification by applying up to a 50,000 pound pulling force to the payeyes. The vehicle's upper arm can be extended to about 40 feet high or can be lowered to a level permitting the vehicle to pull or carry articles into buildings on the wharf.

Abstract: A method and apparatus is provided for first heating surfaces to be welded together by one or two induction coils placed therebetween and upon raising both surfaces to a forging temperature forcing said surfaces together with sufficient force to weld the surfaces together. The heating and upsetting steps occur when the surfaces are in a substantially inert atmosphere.

Abstract: A method and apparatus is disclosed for induction heating weldable surfaces and moving the heated surfaces together with sufficient force to upset the surfaces while in a substantially inert atmosphere for thereby welding the surfaces together. The apparatus includes a rotary bus bar joint for moving the induction coil between the weldable surfaces, and also includes a clamping mechanism for handling members having weldable surfaces of different sizes and shapes. A pair of separately controlled induction coils may be used with or without laminations for heating tubular or solid members to an upsetting temperature.

Abstract: A method and apparatus is disclosed for purging air from multiple surfaces of members to be welded together. The apparatus includes a hood with the inert gas entering the hood at about 150 cubic feet per minute at between 2-5 pounds per square inch gauge when handling approximately 21/2 inch diameter tubes. The gas is first evenly spread in the hood to fill the entire cross sectional area thereof and is then moved through a straightening section to provide laminar flow of the gas across the multiple surfaces. An induction coil is moved between hood closure means into the hood to heat the weldable surfaces to a bonding temperature and after the coils have been removed from the hood, the members are urged together to upset the heated surfaces to weld the two members together.