28,168 research outputs found

    Repair of honeycomb panels with welded breakaway studs

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    Damaged metallic honeycomb panels can be repaired by drilling holes and welding breakaway studs to both facing sheets. Minimal heat required for welding reduces distortion of highly stressed panels. Repairs can be made without the use of doublers and with greater strength when doublers are used

    Zero gravity liquid mixer

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    An apparatus for mixing liquids under conditions of zero gravity is disclosed. The apparatus is comprised of a closed reservoir for the liquids, with a means for maintaining a positive pressure on the liquids in the reservoir. A valved liquid supply line is connected to the reservoir for supplying the reservoir with the liquids to be mixed in the reservoir. The portion of the reservoir containing the liquids to be mixed is in communication with a pump which alternately causes a portion of the liquids to flow out of the pump and into the reservoir to mix the liquids. The fluids in the reservoir are in communication through a conduit with the pump which alternately causes a portion of the fluids to flow out of the pump and into the sphere. The conduit connecting the pump and sphere may contain a nozzle or other jet-forming structure such as a venturi for further mixing the fluids

    Air removal device

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    The disclosure concerns a device suitable for removing air from water under both zero and one 'g' gravity conditions. The device is comprised of a pair of spaced membranes on being hydrophobic and the other being hydrophilic. The air-water mixture is introduced into the space therebetween, and the selective action of the membranes yields removal of the air from the water

    Fear and loathing of central banks in America

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    The Federal Reserve System is America’s uneasy compromise between our dislike of concentrated financial power and our desire to promote efficiency in our national payments system. In fact, the Federal Reserve is the nation’s third attempt to establish a large national bank—what we now call a central bank—that is in a unique position to influence a nation’s money and credit. This Commentary retells the story of the rise and fall of the two earlier national banks, the Banks of the United States.Banks and banking, Central ; Banks and banking - History
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