Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Girard or search for Girard in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
Synclinal. Anti-friction bearing. Anti-fric′tion Bear′ing. A rolling bearing for an axle or gudgeon. The intention is that the parts primarily in contact shall not rub against each other, but move in unison. In one form the roller surfaces impinge upon the surfaces of the axle and its box (Fig. 261); in another form the rollers are on axles (see Fig. 263). A familiar illustration is also found in the improved form of hanging grindstones (see Fig. 265). The Palier glissant, of Girard, consists of a journal box whose lower part is grooved and has an aperture communicating with a pipe through which water under a heavy pressure is introduced beneath the journal. The effect of this is to slightly lift the journal, allowing a very thin film of water to escape, which effectually lubricates the bearing, entirely preventing contact of the metallic surfaces. This is analogous to the hydraulic pivot for turbine wheels, invented by the same engineer, in which the weight of the
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
ter of a number of hose-pipes into one stream which may be directed in one jet of from 4 to 7 inches in diameter upon a bank at a distance of 200 feet, if necessary to stand at that distance to avoid caving. Hy-drau′li-con. （Music.) A water-organ. This form was known to the Alexandrian Greeks in the time of Hero, 150 B. C. It is supposed that air was forced by means of water. If so, it was rather a water-bellows. See organ. Hy-drau′lic Piv′ot. （Machinery.) A contrivance of Girard by which a film or body of water is introduced below the end of a vertical axis to bear the weight thereof, and prevent the actual friction of the axis on its step. The hydraulic pivot, or liquid bearing, for stepping vertical shafts, is described in Bramah's planing-machine, English patent, 1802. See Journalbearing; palier-glissant. Hy-drau′lic Plat′form-lift. （Hoisting.) A form of hoisting-apparatus (L, page 1157) in which the small pump a, operated by the lever b, is