Athenian cultural dominance continued throughout the Roman period, and the buildings added to the Agora reflect the educational role of the city, a role that ended only with the closing of the pagan philosophical schools by the Christian emperor Justinian in A.D. 529.
Bearing, in machine construction, a connector (usually a support) that permits the connected members to rotate or to move in a straight line relative to one another. Often one of the members is fixed, and the bearing acts as a support for the moving member. Most bearings support rotating shafts against either transverse (radial) or thrust (axial) loads.
Types of Plain Bearings (Bushings) - A ThomasNet Buying Guide Plain Bearings (Bushings) are mechanical elements used to reduce friction between rotating shafts and stationary support members. Typically, a bushing relies on soft metal or plastic and an oil film to support the rotating shaft on the hardened shaft journal. Plain bearings (bushings) are used primarily in machinery that has a rotating or a sliding shaft component. Also called sleeve bearings, journal bearings, or sliding bearings, plain bearings have no rolling elements.