. Machinery and processes of the industrial arts, and apparatus of the exact sciences. y its pressure, to lift the journal to belubricated$ and secondly, by its fluidity, to form a liquid bed or cushionbetween the journal and its box, on which the journal may rest in itsrevolution, without touching the metal of the box at all. The construction will be understood by referring to the figure. Oneof the journals is represented as removed, and in the cylindrical surfaceof the socket are seen grooves occupying a considerable part of the areaexposed. These grooves communicate, by an aperture in the m
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. y its pressure, to lift the journal to belubricated$ and secondly, by its fluidity, to form a liquid bed or cushionbetween the journal and its box, on which the journal may rest in itsrevolution, without touching the metal of the box at all. The construction will be understood by referring to the figure. Oneof the journals is represented as removed, and in the cylindrical surfaceof the socket are seen grooves occupying a considerable part of the areaexposed. These grooves communicate, by an aperture in the middle,with a tube which is represented externally, and wrhich sends a branchto the other journal, through which water under a heavy pressure isintroduced into the box beneath the journal. The effect of the hydraulic14 I A 210 PARIS UNIVERSAL EXPOSITION. pressure is to lift the axle, opening a passage for tlie escape of the com-pressed water, which at the same time, because of its release from com-pression, loses the power to sustain the weight. If, therefore, by the first Fig-. impulse, the axleis thrown upwardto any sensible dis-tance, it will imme-diately fall backagain, once moreconfining more orless completely thewater. After oneor two oscillations,therefore, the axlewill settle itself atlength in a positionin which, while thewater will escape,it will escape butas a film of inap-preciable this conditionGirards Palier Glissant. the journal turns upon a liquid bed, and the resistance to its revolution is so excessivelysmall that a slow rotation given by hand to a wheel sustained by itwill be maintained for many minutes without perceptible fact, the most striking illustration which can be given of the immensesuperiority of the palier glissant over a support lubricated in anyother way, is furnished by placing two precisely similar wheels ordisks side by side, weighing five or six pounds each, with a diameterof seven or eight inches, and journals
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
